diff --git a/core/physics/__init__.py b/core/physics/__init__.py
index 9486252d..16705b9a 100644
--- a/core/physics/__init__.py
+++ b/core/physics/__init__.py
@@ -5,6 +5,10 @@ Three physics sublayers:
   compositional — binding, digest, reasoning, articulation (ADR-0009)
   identity     — identity manifold, drives, exertion, character (ADR-0010)
 
+Third-Door Horizon (ADR-0238–0240):
+  coherence GoldTether, dynamic manifold (Procrustes/PCA), surprise dual,
+  biography holonomy, temporal gate, self-authorship miner.
+
 All operators are stateless and frozen where possible.
 State lives in the FieldState; operators are pure transformations.
 """
@@ -22,6 +26,50 @@ from core.physics.drive import DriveGradientMap, GradientField, ValueAxis
 from core.physics.exertion import ExertionMeter, FatigueIndex, CycleCost
 from core.physics.identity import IdentityManifold, IdentityCheck, IdentityScore, CharacterProfile
 from core.physics.learning import PromotionDecision, VaultPromotionPolicy
+from core.physics.goldtether import (
+    AutonomyBand,
+    AutonomyDecision,
+    CoherenceResidual,
+    GoldTetherConfig,
+    GoldTetherMonitor,
+    OperatingMode,
+    PseudoscalarFloorState,
+    derive_kappa,
+)
+from core.physics.dynamic_manifold import (
+    AxisClassification,
+    CartanIwasawaFactors,
+    ConformalProcrustesResult,
+    PrincipalAxis,
+    SignatureAwarePCAResult,
+    cartan_iwasawa_factorize,
+    conformal_procrustes,
+    dual_correction_slerp,
+    procrustes_residual,
+    signature_aware_pca,
+)
+from core.physics.surprise import (
+    AnalogySeed,
+    DualOperatorResult,
+    SurpriseResult,
+    analogy_seed,
+    dual_operator,
+    project_onto_basis,
+    surprise_residual,
+)
+from core.physics.biography import (
+    BiographyHolonomyBlade,
+    biography_telemetry,
+    integrate_biography,
+    reconstruct_biography,
+)
+from core.physics.temporal_gate import (
+    TemporalAdmissibilityGate,
+    TemporalContext,
+    TemporalDecision,
+    TemporalVerdict,
+)
+from core.physics.self_authorship import AuthorshipProposal, SelfAuthorshipMiner
 
 __all__ = [
     "SalienceOperator", "SalienceMap", "FieldRegion",
@@ -36,4 +84,42 @@ __all__ = [
     "ExertionMeter", "FatigueIndex", "CycleCost",
     "IdentityManifold", "IdentityCheck", "IdentityScore", "CharacterProfile",
     "PromotionDecision", "VaultPromotionPolicy",
+    # ADR-0238
+    "AutonomyBand",
+    "AutonomyDecision",
+    "CoherenceResidual",
+    "GoldTetherConfig",
+    "GoldTetherMonitor",
+    "OperatingMode",
+    "PseudoscalarFloorState",
+    "derive_kappa",
+    # ADR-0239
+    "AxisClassification",
+    "CartanIwasawaFactors",
+    "ConformalProcrustesResult",
+    "PrincipalAxis",
+    "SignatureAwarePCAResult",
+    "cartan_iwasawa_factorize",
+    "conformal_procrustes",
+    "dual_correction_slerp",
+    "procrustes_residual",
+    "signature_aware_pca",
+    "AnalogySeed",
+    "DualOperatorResult",
+    "SurpriseResult",
+    "analogy_seed",
+    "dual_operator",
+    "project_onto_basis",
+    "surprise_residual",
+    # ADR-0240
+    "BiographyHolonomyBlade",
+    "biography_telemetry",
+    "integrate_biography",
+    "reconstruct_biography",
+    "TemporalAdmissibilityGate",
+    "TemporalContext",
+    "TemporalDecision",
+    "TemporalVerdict",
+    "AuthorshipProposal",
+    "SelfAuthorshipMiner",
 ]
diff --git a/core/physics/biography.py b/core/physics/biography.py
new file mode 100644
index 00000000..8fb07a20
--- /dev/null
+++ b/core/physics/biography.py
@@ -0,0 +1,107 @@
+"""core.physics.biography — Biography Holonomy Blade (ADR-0240).
+
+Forever-lived individuality as an integrated holonomy of the identity
+trajectory. Reconstructible from an ordered sequence of session versors —
+reconstruction-over-storage. Not a raw experience dump; not a parallel
+identity store.
+
+Integrates with ``algebra.holonomy.holonomy_encode`` and the identity motor
+surface; does not mutate packs, vault, or serving paths.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Any, Sequence
+
+import numpy as np
+
+from algebra.cl41 import N_COMPONENTS
+from algebra.holonomy import holonomy_encode, holonomy_similarity
+from algebra.versor import unitize_versor, versor_condition
+
+_CLOSURE_TOL = 1e-6
+_TELEMETRY_SCHEMA = "biography_holonomy_v1"
+
+
+@dataclass(frozen=True, slots=True)
+class BiographyHolonomyBlade:
+    """Integrated holonomy blade of a lived trajectory."""
+
+    blade: np.ndarray
+    n_steps: int
+    trajectory_hash: str
+    closure: float
+
+    def similarity(self, other: "BiographyHolonomyBlade") -> float:
+        return float(holonomy_similarity(self.blade, other.blade))
+
+
+def _as_versor(v: np.ndarray, name: str) -> np.ndarray:
+    arr = np.asarray(v, dtype=np.float64)
+    if arr.shape != (N_COMPONENTS,):
+        raise ValueError(f"{name} must have shape ({N_COMPONENTS},)")
+    # Construction boundary: trajectory elements must be closed versors.
+    try:
+        closed = unitize_versor(arr)
+    except ValueError as exc:
+        raise ValueError(f"{name} is not a closed versor: {exc}") from exc
+    cond = versor_condition(closed)
+    if cond >= _CLOSURE_TOL:
+        raise ValueError(f"{name} versor_condition={cond:.3e}")
+    return closed.astype(np.float64, copy=False)
+
+
+def _trajectory_hash(versors: Sequence[np.ndarray]) -> str:
+    import hashlib
+
+    h = hashlib.sha256()
+    for v in versors:
+        h.update(np.asarray(v, dtype=np.float64).tobytes())
+    return h.hexdigest()
+
+
+def integrate_biography(
+    trajectory: Sequence[np.ndarray],
+    *,
+    alpha: float = 0.5,
+) -> BiographyHolonomyBlade:
+    """Integrate ordered identity/session versors into a biography holonomy blade.
+
+    Order is load-bearing. Empty trajectory is refused (no confabulated self).
+    """
+    if not trajectory:
+        raise ValueError("biography trajectory must be non-empty")
+    closed = [_as_versor(v, f"trajectory[{i}]") for i, v in enumerate(trajectory)]
+    blade = holonomy_encode(closed, alpha=alpha)
+    cond = versor_condition(blade)
+    if cond >= _CLOSURE_TOL:
+        raise ValueError(f"biography blade not closed: {cond:.3e}")
+    return BiographyHolonomyBlade(
+        blade=np.asarray(blade, dtype=np.float64),
+        n_steps=len(closed),
+        trajectory_hash=_trajectory_hash(closed),
+        closure=float(cond),
+    )
+
+
+def reconstruct_biography(
+    trajectory: Sequence[np.ndarray],
+    *,
+    alpha: float = 0.5,
+) -> BiographyHolonomyBlade:
+    """Alias for integrate — reconstruction is recompute, not storage load."""
+    return integrate_biography(trajectory, alpha=alpha)
+
+
+def biography_telemetry(blade: BiographyHolonomyBlade) -> dict[str, Any]:
+    """Workbench-safe projection (no full multivector dump required for UI)."""
+    return {
+        "schema_version": _TELEMETRY_SCHEMA,
+        "n_steps": int(blade.n_steps),
+        "trajectory_hash": blade.trajectory_hash,
+        "closure": float(blade.closure),
+        "blade_scalar": float(blade.blade[0]),
+        "blade_pseudoscalar": float(blade.blade[31]),
+        "blade_l2": float(np.linalg.norm(blade.blade)),
+    }
diff --git a/core/physics/dynamic_manifold.py b/core/physics/dynamic_manifold.py
new file mode 100644
index 00000000..e955138f
--- /dev/null
+++ b/core/physics/dynamic_manifold.py
@@ -0,0 +1,449 @@
+"""core.physics.dynamic_manifold — Conformal manifold operators (ADR-0239).
+
+Signature-aware PCA with explicit null classification, Conformal Procrustes
+(versor search for structural analogy), Cartan–Iwasawa constructive
+factorization for dual-correction slerp, and a dedicated Procrustes residual
+norm (not null-margin; not ADR-0006 energy residual).
+
+All operators are pure and deterministic. Null eigenvectors are never silently
+skipped — they are classified and returned.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from enum import Enum
+from typing import Sequence
+
+import numpy as np
+
+from algebra.cl41 import (
+    N_COMPONENTS,
+    SIGNATURE,
+    geometric_product,
+    grade_project,
+    reverse,
+)
+from algebra.rotor import word_transition_rotor
+from algebra.versor import unitize_versor, versor_apply, versor_condition
+
+_CLOSURE_TOL = 1e-6
+_NEAR_ZERO = 1e-12
+_NULL_TOL = 1e-8
+_METRIC = np.ones(N_COMPONENTS, dtype=np.float64)
+# Grade-1 components (indices 1..5) carry Cl(4,1) signature (+,+,+,+,-).
+_METRIC[1:6] = SIGNATURE.astype(np.float64)
+
+
+class AxisClassification(str, Enum):
+    SPACELIKE = "spacelike"
+    TIMELIKE = "timelike"
+    NULL = "null"
+    DEGENERATE = "degenerate"
+
+
+@dataclass(frozen=True, slots=True)
+class PrincipalAxis:
+    vector: tuple[float, ...]
+    eigenvalue: float
+    classification: AxisClassification
+    metric_quadratic: float
+
+
+@dataclass(frozen=True, slots=True)
+class SignatureAwarePCAResult:
+    axes: tuple[PrincipalAxis, ...]
+    mean: tuple[float, ...]
+    explained: tuple[float, ...]
+    n_points: int
+    n_null: int
+    n_spacelike: int
+    n_timelike: int
+    n_degenerate: int
+
+
+@dataclass(frozen=True, slots=True)
+class ConformalProcrustesResult:
+    versor: np.ndarray
+    residual_norm: float
+    n_pairs: int
+    pair_residuals: tuple[float, ...]
+
+
+@dataclass(frozen=True, slots=True)
+class CartanIwasawaFactors:
+    """Constructive K · A · N factorization for dual-correction surfaces.
+
+    K — compact (rotation-like, B² < 0 planes)
+    A — abelian (boost-like, B² > 0 planes)
+    N — nilpotent / residual (null + higher-grade remainder, unitized if needed)
+    """
+
+    K: np.ndarray
+    A: np.ndarray
+    N: np.ndarray
+    reconstruction_residual: float
+
+
+def _as_points(points: Sequence[np.ndarray]) -> np.ndarray:
+    if not points:
+        raise ValueError("signature_aware_pca requires at least one point")
+    rows = []
+    for i, p in enumerate(points):
+        arr = np.asarray(p, dtype=np.float64)
+        if arr.shape != (N_COMPONENTS,):
+            raise ValueError(
+                f"point[{i}] must have shape ({N_COMPONENTS},); got {arr.shape}"
+            )
+        rows.append(arr)
+    return np.stack(rows, axis=0)
+
+
+def _metric_quadratic_form(v: np.ndarray) -> float:
+    """Quadratic form on grade-1 part under Cl(4,1) signature; higher grades +.
+
+    Used only for axis *classification*, not as a substitute for versor_condition.
+    """
+    g1 = v[1:6]
+    q = float(np.dot(g1 * _METRIC[1:6], g1))
+    higher = float(np.dot(v[6:], v[6:]))
+    scalar = float(v[0] * v[0])
+    return q + higher + scalar
+
+
+def _classify_axis(v: np.ndarray) -> tuple[AxisClassification, float]:
+    nrm = float(np.linalg.norm(v))
+    if nrm < _NEAR_ZERO:
+        return AxisClassification.DEGENERATE, 0.0
+    q = _metric_quadratic_form(v)
+    # Grade-1 signature sense dominates classification when g1 is present.
+    g1 = v[1:6]
+    g1_q = float(np.dot(g1 * _METRIC[1:6], g1))
+    g1_n = float(np.linalg.norm(g1))
+    if g1_n < _NEAR_ZERO:
+        # Pure higher-grade axis: treat as spacelike if energy present else degenerate.
+        if nrm < _NULL_TOL:
+            return AxisClassification.DEGENERATE, q
+        return AxisClassification.SPACELIKE, q
+    if abs(g1_q) < _NULL_TOL:
+        return AxisClassification.NULL, g1_q
+    if g1_q > 0.0:
+        return AxisClassification.SPACELIKE, g1_q
+    return AxisClassification.TIMELIKE, g1_q
+
+
+def signature_aware_pca(
+    points: Sequence[np.ndarray],
+    *,
+    max_axes: int | None = None,
+) -> SignatureAwarePCAResult:
+    """Signature-aware PCA on Cl(4,1) multivector clouds.
+
+    1. Center the cloud in coefficient space.
+    2. Form the metric-rescaled covariance (whitening by √|G| on coords).
+    3. Eigen-decompose symmetrically (deterministic via numpy eigh).
+    4. Classify every axis — null axes are returned, never dropped.
+    """
+    X = _as_points(points)
+    n = X.shape[0]
+    mean = X.mean(axis=0)
+    Xc = X - mean
+
+    # Metric rescaling: multiply each coordinate by sqrt(|g_ii|)*sign-preserving weight.
+    # For signature -1 on e5, use imaginary-free absolute metric then restore sense
+    # via classification (not by complex eigen).
+    scale = np.sqrt(np.abs(_METRIC))
+    scale = np.where(scale < _NEAR_ZERO, 1.0, scale)
+    Y = Xc * scale  # broadcast
+
+    # Covariance of rescaled coordinates.
+    if n == 1:
+        cov = np.zeros((N_COMPONENTS, N_COMPONENTS), dtype=np.float64)
+    else:
+        cov = (Y.T @ Y) / float(n)
+
+    # Symmetric eigh → ascending eigenvalues; reverse for explained variance order.
+    evals, evecs = np.linalg.eigh(cov)
+    order = np.argsort(evals)[::-1]
+    evals = evals[order]
+    evecs = evecs[:, order]
+
+    k = N_COMPONENTS if max_axes is None else min(int(max_axes), N_COMPONENTS)
+    total = float(np.sum(np.clip(evals, 0.0, None)))
+    axes: list[PrincipalAxis] = []
+    counts = {
+        AxisClassification.NULL: 0,
+        AxisClassification.SPACELIKE: 0,
+        AxisClassification.TIMELIKE: 0,
+        AxisClassification.DEGENERATE: 0,
+    }
+    explained_list: list[float] = []
+
+    for i in range(k):
+        # Map eigenvector back from metric-rescaled coords.
+        v_scaled = evecs[:, i]
+        v = v_scaled / scale
+        nrm = float(np.linalg.norm(v))
+        if nrm > _NEAR_ZERO:
+            v = v / nrm
+        # Deterministic sign convention: first nonzero component positive.
+        for c in v:
+            if abs(c) > _NEAR_ZERO:
+                if c < 0.0:
+                    v = -v
+                break
+        cls, mq = _classify_axis(v)
+        counts[cls] = counts.get(cls, 0) + 1
+        ev = float(max(0.0, evals[i]))
+        frac = float(ev / total) if total > _NEAR_ZERO else 0.0
+        explained_list.append(frac)
+        axes.append(
+            PrincipalAxis(
+                vector=tuple(float(x) for x in v),
+                eigenvalue=ev,
+                classification=cls,
+                metric_quadratic=float(mq),
+            )
+        )
+
+    return SignatureAwarePCAResult(
+        axes=tuple(axes),
+        mean=tuple(float(x) for x in mean),
+        explained=tuple(explained_list),
+        n_points=n,
+        n_null=counts[AxisClassification.NULL],
+        n_spacelike=counts[AxisClassification.SPACELIKE],
+        n_timelike=counts[AxisClassification.TIMELIKE],
+        n_degenerate=counts[AxisClassification.DEGENERATE],
+    )
+
+
+def procrustes_residual(
+    source: np.ndarray,
+    target: np.ndarray,
+    versor: np.ndarray,
+) -> float:
+    """Dedicated Procrustes residual: || V * s * reverse(V) - t ||_F.
+
+    Named separately from null-margin and energy coherence_residual so it
+    cannot be silently reused as a different residual.
+    """
+    s = np.asarray(source, dtype=np.float64)
+    t = np.asarray(target, dtype=np.float64)
+    V = np.asarray(versor, dtype=np.float64)
+    mapped = versor_apply(V, s)
+    return float(np.linalg.norm(mapped - t))
+
+
+def conformal_procrustes(
+    sources: Sequence[np.ndarray] | np.ndarray,
+    targets: Sequence[np.ndarray] | np.ndarray,
+) -> ConformalProcrustesResult:
+    """Find a unit versor aligning source structure to target structure.
+
+    Single pair: closed transition rotor.
+    Multiple pairs: manifold average of per-pair transition rotors via
+    successive equal-weight slerp composition (deterministic order).
+    """
+    if isinstance(sources, np.ndarray) and sources.ndim == 1:
+        src_list = [sources]
+    else:
+        src_list = list(sources)  # type: ignore[arg-type]
+    if isinstance(targets, np.ndarray) and targets.ndim == 1:
+        tgt_list = [targets]
+    else:
+        tgt_list = list(targets)  # type: ignore[arg-type]
+
+    if len(src_list) != len(tgt_list):
+        raise ValueError("sources and targets must have equal length")
+    if not src_list:
+        raise ValueError("conformal_procrustes requires at least one pair")
+
+    rotors: list[np.ndarray] = []
+    for i, (s, t) in enumerate(zip(src_list, tgt_list)):
+        s_arr = np.asarray(s, dtype=np.float64)
+        t_arr = np.asarray(t, dtype=np.float64)
+        if s_arr.shape != (N_COMPONENTS,) or t_arr.shape != (N_COMPONENTS,):
+            raise ValueError(f"pair[{i}] must be 32-component multivectors")
+        # Construction boundary: transition rotor is a closed unit versor.
+        R = word_transition_rotor(s_arr, t_arr)
+        rotors.append(np.asarray(R, dtype=np.float64))
+
+    # Manifold average: sequential geodesic midpoints in pair order.
+    V = rotors[0].copy()
+    for k, R in enumerate(rotors[1:], start=2):
+        # Slerp V toward R with weight 1/k so equal contribution in the limit.
+        try:
+            T = word_transition_rotor(V, R)
+            from algebra.rotor import rotor_power
+
+            T_a = rotor_power(T, 1.0 / float(k))
+            V = geometric_product(geometric_product(T_a, V), reverse(T_a)).astype(
+                np.float64
+            )
+            V = unitize_versor(V)
+        except ValueError:
+            # Fail closed to previous average if a pair is non-connectable.
+            continue
+
+    cond = versor_condition(V)
+    if cond >= _CLOSURE_TOL:
+        raise ValueError(f"Procrustes versor not closed: condition={cond:.3e}")
+
+    pair_res = tuple(
+        procrustes_residual(s, t, V) for s, t in zip(src_list, tgt_list)
+    )
+    residual_norm = float(np.sqrt(sum(r * r for r in pair_res) / len(pair_res)))
+    return ConformalProcrustesResult(
+        versor=V.astype(np.float64, copy=False),
+        residual_norm=residual_norm,
+        n_pairs=len(src_list),
+        pair_residuals=pair_res,
+    )
+
+
+def _identity_mv() -> np.ndarray:
+    out = np.zeros(N_COMPONENTS, dtype=np.float64)
+    out[0] = 1.0
+    return out
+
+
+def cartan_iwasawa_factorize(V: np.ndarray) -> CartanIwasawaFactors:
+    """Constructive Cartan–Iwasawa-style factorization of a closed versor.
+
+    For simple scalar+bivector rotors:
+    - If B² < 0 → pure K (rotation)
+    - If B² > 0 → pure A (boost)
+    - If B² ≈ 0 and B ≠ 0 → pure N (null)
+    - Mixed: split bivector energy by sign of B² contribution and leave residual N.
+
+    Reconstruction: K * A * N; residual measured in coefficient space.
+    """
+    V_arr = np.asarray(V, dtype=np.float64)
+    if V_arr.shape != (N_COMPONENTS,):
+        raise ValueError(f"V must have shape ({N_COMPONENTS},)")
+    cond = versor_condition(V_arr)
+    if cond >= 1e-2:
+        # Construction boundary: attempt unitize only at this explicit boundary.
+        V_arr = unitize_versor(V_arr)
+        cond = versor_condition(V_arr)
+    if cond >= _CLOSURE_TOL:
+        raise ValueError(f"cartan_iwasawa_factorize: input not closed ({cond:.3e})")
+
+    scalar = float(V_arr[0])
+    B = grade_project(V_arr, 2)
+    higher = V_arr.copy()
+    higher[0] = 0.0
+    higher[6:16] = 0.0  # clear grade-2; keep 1,3,4,5
+
+    B_sq = geometric_product(B, B).astype(np.float64)
+    bsq_scalar = float(B_sq[0])
+    B_sq_res = B_sq.copy()
+    B_sq_res[0] = 0.0
+    simple = float(np.linalg.norm(B_sq_res)) < 1e-6
+    b_norm = float(np.linalg.norm(B))
+
+    I = _identity_mv()
+    K = I.copy()
+    A = I.copy()
+    N = I.copy()
+
+    if b_norm < _NEAR_ZERO and float(np.linalg.norm(higher)) < _NEAR_ZERO:
+        # Near-identity
+        K = V_arr.copy()
+    elif simple and bsq_scalar < 0.0:
+        K = V_arr.copy()
+        # Zero out non-scalar/bivector if any residual grades present.
+        K = grade_project(K, 0) + grade_project(K, 2)
+        K = unitize_versor(K)
+    elif simple and bsq_scalar > 0.0:
+        A = grade_project(V_arr, 0) + grade_project(V_arr, 2)
+        A = unitize_versor(A)
+    elif simple and abs(bsq_scalar) <= _NEAR_ZERO:
+        N_cand = grade_project(V_arr, 0) + grade_project(V_arr, 2)
+        try:
+            N = unitize_versor(N_cand)
+        except ValueError:
+            N = I.copy()
+            N[0] = scalar if abs(scalar) > _NEAR_ZERO else 1.0
+            N = unitize_versor(N)
+    else:
+        # Mixed: put scalar+rotation-like half in K, boost-like half in A, rest N.
+        # Split B into two parallel bivectors by halving coefficients when non-simple.
+        half = B * 0.5
+        K = grade_project(V_arr, 0) * 0.0
+        K[0] = abs(scalar) ** 0.5 if abs(scalar) > _NEAR_ZERO else 1.0
+        K = K + half
+        try:
+            K = unitize_versor(K)
+        except ValueError:
+            K = I.copy()
+        A = I.copy()
+        A[0] = abs(scalar) ** 0.5 if abs(scalar) > _NEAR_ZERO else 1.0
+        A = A + half
+        try:
+            A = unitize_versor(A)
+        except ValueError:
+            A = I.copy()
+        # N absorbs higher-grade residual relative to K*A
+        KA = geometric_product(K, A)
+        try:
+            N = unitize_versor(geometric_product(reverse(KA), V_arr))
+        except ValueError:
+            N = I.copy()
+
+    recon = geometric_product(geometric_product(K, A), N)
+    recon_res = float(np.linalg.norm(recon - V_arr))
+
+    for name, factor in (("K", K), ("A", A), ("N", N)):
+        c = versor_condition(factor)
+        if c >= _CLOSURE_TOL:
+            raise ValueError(f"Cartan–Iwasawa factor {name} not closed: {c:.3e}")
+
+    return CartanIwasawaFactors(
+        K=K.astype(np.float64, copy=False),
+        A=A.astype(np.float64, copy=False),
+        N=N.astype(np.float64, copy=False),
+        reconstruction_residual=recon_res,
+    )
+
+
+def dual_correction_slerp(
+    source: np.ndarray,
+    target: np.ndarray,
+    alpha: float,
+) -> np.ndarray:
+    """Slerp on Cartan–Iwasawa factors of the transition rotor (dual-correction).
+
+    Factors are powered independently then recomposed as left action on source:
+
+        R = target * reverse(source) = K A N
+        out = (K^α A^α N^α) * source
+
+    α=0 → source; α=1 → target for unit versors. Sandwich conjugation is not
+    the state geodesic (see ADR-0238 supervised_blend).
+    """
+    from algebra.rotor import rotor_power
+
+    a = float(alpha)
+    if a < 0.0 or a > 1.0:
+        raise ValueError("alpha must be in [0, 1]")
+    src = np.asarray(source, dtype=np.float64)
+    tgt = np.asarray(target, dtype=np.float64)
+    if a <= _NEAR_ZERO:
+        out = src.copy()
+    elif a >= 1.0 - _NEAR_ZERO:
+        out = tgt.copy()
+    else:
+        R = word_transition_rotor(src, tgt)
+        factors = cartan_iwasawa_factorize(R)
+        K_a = rotor_power(factors.K, a)
+        A_a = rotor_power(factors.A, a)
+        N_a = rotor_power(factors.N, a)
+        R_a = geometric_product(geometric_product(K_a, A_a), N_a)
+        R_a = unitize_versor(R_a)
+        out = geometric_product(R_a, src).astype(np.float64)
+    cond = versor_condition(out)
+    if cond >= _CLOSURE_TOL:
+        raise ValueError(f"dual_correction_slerp broke closure: {cond:.3e}")
+    return out
diff --git a/core/physics/goldtether.py b/core/physics/goldtether.py
new file mode 100644
index 00000000..21b21dae
--- /dev/null
+++ b/core/physics/goldtether.py
@@ -0,0 +1,432 @@
+"""core.physics.goldtether — Coherence GoldTether (ADR-0238).
+
+This module implements the *field* GoldTether: dynamic grade-5 pseudoscalar
+floor, harmonized coherence residual, and practice/serve autonomy modulation.
+
+It is intentionally distinct from the *arena* GoldTether protocol in
+``core.learning_arena.protocols.GoldTether`` (ADR-0199), which scores practice
+attempts against independent truth anchors. Shared metaphor; different contracts.
+Never import or subclass the arena protocol from this module.
+
+Construction boundary: supervised blend closes via ``algebra.rotor`` manifold
+slerp (``word_transition_rotor`` + ``rotor_power``). No hot-path drift repair.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field, replace
+from enum import Enum
+from typing import Any, Mapping
+
+import numpy as np
+
+from algebra.cl41 import N_COMPONENTS, geometric_product, reverse
+from algebra.rotor import rotor_power, word_transition_rotor
+from algebra.versor import versor_condition
+
+_PSEUDOSCALAR_IDX = 31
+_CLOSURE_TOL = 1e-6
+_NEAR_ZERO = 1e-12
+_DEFAULT_DECAY_N = 32
+_DEFAULT_W_DRIFT = 0.35
+_DEFAULT_FLOOR_INIT = 0.15
+_DEFAULT_CRITICAL_RATIO = 2.5
+_TELEMETRY_SCHEMA = "goldtether_coherence_v1"
+
+
+class OperatingMode(str, Enum):
+    """Practice vs Serve — risk-reward physics boundary."""
+
+    PRACTICE = "practice"
+    SERVE = "serve"
+
+
+class AutonomyBand(str, Enum):
+    """Residual-relative autonomy envelope (ADR-0238)."""
+
+    AUTONOMOUS = "autonomous"
+    SUPERVISED_BLEND = "supervised_blend"
+    FAIL_CLOSED = "fail_closed"
+
+
+@dataclass(frozen=True, slots=True)
+class GoldTetherConfig:
+    """Named configuration only — no silent magic constants at call sites."""
+
+    decay_N: int = _DEFAULT_DECAY_N
+    w_drift: float = _DEFAULT_W_DRIFT
+    floor_init: float = _DEFAULT_FLOOR_INIT
+    critical_ratio: float = _DEFAULT_CRITICAL_RATIO
+    practice_autonomy_enabled: bool = False
+    serve_supervised_blend_authorized: bool = False
+
+    def __post_init__(self) -> None:
+        if self.decay_N < 1:
+            raise ValueError("decay_N must be >= 1")
+        if not 0.0 <= self.w_drift <= 1.0:
+            raise ValueError("w_drift must be in [0, 1]")
+        if self.floor_init <= 0.0:
+            raise ValueError("floor_init must be positive")
+        if self.critical_ratio <= 1.0:
+            raise ValueError("critical_ratio must be > 1")
+
+
+@dataclass(frozen=True, slots=True)
+class CoherenceResidual:
+    """Harmonized residual: drift + geometric distance (normalized).
+
+    Distinct from ADR-0006 ``EnergyProfile.coherence_residual`` and from
+    ADR-0239 Procrustes/Surprise residuals.
+    """
+
+    drift: float
+    geometric_distance: float
+    combined: float
+    kappa: float
+    pseudoscalar_current: float
+    pseudoscalar_reference: float
+
+
+@dataclass(frozen=True, slots=True)
+class AutonomyDecision:
+    band: AutonomyBand
+    residual: float
+    floor: float
+    critical: float
+    mode: OperatingMode
+    blend_alpha: float
+    reason: str
+
+
+@dataclass(frozen=True, slots=True)
+class PseudoscalarFloorState:
+    """Dynamic grade-5 coherence floor + sign/magnitude telemetry."""
+
+    value: float
+    sign: float
+    n_samples: int
+    last_update_step: int
+    primal_floor: float
+    recent_residuals: tuple[float, ...] = ()
+
+
+def _as_mv(v: np.ndarray, name: str) -> np.ndarray:
+    arr = np.asarray(v, dtype=np.float64)
+    if arr.shape != (N_COMPONENTS,):
+        raise ValueError(f"{name} must have shape ({N_COMPONENTS},); got {arr.shape}")
+    return arr
+
+
+def _pseudoscalar(v: np.ndarray) -> float:
+    return float(v[_PSEUDOSCALAR_IDX])
+
+
+def _geometric_distance(a: np.ndarray, b: np.ndarray) -> float:
+    """Closed geometric distance on the versor manifold.
+
+    Uses ``|| reverse(a) * b - 1 ||_F`` — zero iff a and b are the same unit
+    versor (up to float noise). Not cosine similarity; not ANN.
+    """
+    product = geometric_product(reverse(a), b).astype(np.float64)
+    product[0] -= 1.0
+    return float(np.linalg.norm(product))
+
+
+def _normalize_distance(d: float, scale: float = 2.0) -> float:
+    """Map unbounded residual to [0, 1) for blend with drift."""
+    if d <= 0.0:
+        return 0.0
+    return float(d / (d + scale))
+
+
+def derive_kappa(combined_residual: float, floor: float) -> float:
+    """Monotone κ from residual relative to floor.
+
+    κ ∈ (0, 1]: small residual → κ near 1 (more trust); large residual → κ → 0.
+    Used only to scale dual-correction blend weight — never to invent content.
+    """
+    if floor <= _NEAR_ZERO:
+        floor = _NEAR_ZERO
+    ratio = max(0.0, float(combined_residual) / float(floor))
+    return float(1.0 / (1.0 + ratio))
+
+
+@dataclass
+class GoldTetherMonitor:
+    """Stateful monitor for coherence residual, floor, and autonomy decisions.
+
+    State is explicit and reconstructible; updates are pure replacements on
+    ``floor_state`` (immutable snapshots). Deterministic for identical sequences.
+    """
+
+    config: GoldTetherConfig = field(default_factory=GoldTetherConfig)
+    floor_state: PseudoscalarFloorState = field(init=False)
+    _step: int = field(default=0, init=False, repr=False)
+
+    def __post_init__(self) -> None:
+        self.floor_state = PseudoscalarFloorState(
+            value=float(self.config.floor_init),
+            sign=1.0,
+            n_samples=0,
+            last_update_step=0,
+            primal_floor=float(self.config.floor_init),
+            recent_residuals=(),
+        )
+
+    def measure(
+        self,
+        current: np.ndarray,
+        reference: np.ndarray,
+        *,
+        mode: OperatingMode | str = OperatingMode.PRACTICE,
+    ) -> CoherenceResidual:
+        """Compute harmonized coherence residual (pure; does not mutate floor)."""
+        _ = OperatingMode(mode)  # validate
+        cur = _as_mv(current, "current")
+        ref = _as_mv(reference, "reference")
+        ps_c = _pseudoscalar(cur)
+        ps_r = _pseudoscalar(ref)
+        drift = abs(ps_c - ps_r)
+        # Also fold absolute pseudoscalar magnitude loss relative to reference.
+        drift = max(drift, abs(abs(ps_c) - abs(ps_r)))
+        geo = _geometric_distance(ref, cur)
+        geo_n = _normalize_distance(geo)
+        w = float(self.config.w_drift)
+        combined = w * drift + (1.0 - w) * geo_n
+        kappa = derive_kappa(combined, self.floor_state.value)
+        return CoherenceResidual(
+            drift=float(drift),
+            geometric_distance=float(geo),
+            combined=float(combined),
+            kappa=float(kappa),
+            pseudoscalar_current=ps_c,
+            pseudoscalar_reference=ps_r,
+        )
+
+    def update_floor(
+        self,
+        residual: CoherenceResidual | float,
+        *,
+        mode: OperatingMode | str = OperatingMode.PRACTICE,
+        success: bool = True,
+        pseudoscalar_sign: float | None = None,
+    ) -> PseudoscalarFloorState:
+        """Update dynamic floor from practice successes only.
+
+        Serve mode never promotes the floor. Failures only append telemetry
+        window; they do not raise the autonomy envelope.
+        """
+        op_mode = OperatingMode(mode)
+        r = float(residual.combined if isinstance(residual, CoherenceResidual) else residual)
+        self._step += 1
+        recent = list(self.floor_state.recent_residuals) + [r]
+        decay_n = int(self.config.decay_N)
+        if len(recent) > decay_n:
+            recent = recent[-decay_n:]
+
+        new_value = self.floor_state.value
+        new_sign = self.floor_state.sign
+        n_samples = self.floor_state.n_samples
+
+        if op_mode is OperatingMode.PRACTICE and success and r < self.floor_state.value:
+            # Tighten floor toward observed residual while keeping primal anchor.
+            # Weighted mean of recent successes under decay window.
+            window = [x for x in recent if x < self.floor_state.value] or [r]
+            mean_r = float(sum(window) / len(window))
+            # Blend toward mean_r but never below half primal (safety).
+            floor_floor = 0.5 * self.floor_state.primal_floor
+            candidate = 0.5 * self.floor_state.value + 0.5 * mean_r
+            new_value = max(floor_floor, min(self.floor_state.value, candidate))
+            n_samples = n_samples + 1
+            if pseudoscalar_sign is not None and abs(pseudoscalar_sign) > _NEAR_ZERO:
+                new_sign = 1.0 if pseudoscalar_sign >= 0.0 else -1.0
+
+        self.floor_state = PseudoscalarFloorState(
+            value=float(new_value),
+            sign=float(new_sign),
+            n_samples=int(n_samples),
+            last_update_step=int(self._step),
+            primal_floor=float(self.floor_state.primal_floor),
+            recent_residuals=tuple(float(x) for x in recent),
+        )
+        return self.floor_state
+
+    def decide(
+        self,
+        residual: CoherenceResidual | float,
+        *,
+        mode: OperatingMode | str = OperatingMode.PRACTICE,
+        floor: PseudoscalarFloorState | None = None,
+    ) -> AutonomyDecision:
+        """Map residual + mode → autonomy band (HITL-safe defaults)."""
+        op_mode = OperatingMode(mode)
+        r = float(residual.combined if isinstance(residual, CoherenceResidual) else residual)
+        fl = floor if floor is not None else self.floor_state
+        floor_v = float(fl.value)
+        critical = floor_v * float(self.config.critical_ratio)
+
+        if r > critical:
+            return AutonomyDecision(
+                band=AutonomyBand.FAIL_CLOSED,
+                residual=r,
+                floor=floor_v,
+                critical=critical,
+                mode=op_mode,
+                blend_alpha=0.0,
+                reason="residual_above_critical",
+            )
+
+        if op_mode is OperatingMode.SERVE:
+            # Serve never autonomous. Supervised blend only if explicitly authorized.
+            if r < floor_v and self.config.serve_supervised_blend_authorized:
+                alpha = float(1.0 - derive_kappa(r, floor_v))
+                return AutonomyDecision(
+                    band=AutonomyBand.SUPERVISED_BLEND,
+                    residual=r,
+                    floor=floor_v,
+                    critical=critical,
+                    mode=op_mode,
+                    blend_alpha=alpha,
+                    reason="serve_supervised_authorized",
+                )
+            if r < floor_v:
+                return AutonomyDecision(
+                    band=AutonomyBand.FAIL_CLOSED,
+                    residual=r,
+                    floor=floor_v,
+                    critical=critical,
+                    mode=op_mode,
+                    blend_alpha=0.0,
+                    reason="serve_hitl_default_fail_closed",
+                )
+            # floor <= r <= critical on serve: fail-closed unless blend authorized
+            if self.config.serve_supervised_blend_authorized:
+                alpha = float(min(1.0, (r - floor_v) / max(critical - floor_v, _NEAR_ZERO)))
+                return AutonomyDecision(
+                    band=AutonomyBand.SUPERVISED_BLEND,
+                    residual=r,
+                    floor=floor_v,
+                    critical=critical,
+                    mode=op_mode,
+                    blend_alpha=alpha,
+                    reason="serve_midband_supervised",
+                )
+            return AutonomyDecision(
+                band=AutonomyBand.FAIL_CLOSED,
+                residual=r,
+                floor=floor_v,
+                critical=critical,
+                mode=op_mode,
+                blend_alpha=0.0,
+                reason="serve_midband_fail_closed",
+            )
+
+        # Practice path
+        if r < floor_v and self.config.practice_autonomy_enabled:
+            return AutonomyDecision(
+                band=AutonomyBand.AUTONOMOUS,
+                residual=r,
+                floor=floor_v,
+                critical=critical,
+                mode=op_mode,
+                blend_alpha=1.0,
+                reason="practice_below_floor_autonomy_enabled",
+            )
+        if r < floor_v:
+            return AutonomyDecision(
+                band=AutonomyBand.SUPERVISED_BLEND,
+                residual=r,
+                floor=floor_v,
+                critical=critical,
+                mode=op_mode,
+                blend_alpha=float(derive_kappa(r, floor_v)),
+                reason="practice_below_floor_supervised_default",
+            )
+        # floor <= r <= critical
+        alpha = float(1.0 - min(1.0, (r - floor_v) / max(critical - floor_v, _NEAR_ZERO)))
+        return AutonomyDecision(
+            band=AutonomyBand.SUPERVISED_BLEND,
+            residual=r,
+            floor=floor_v,
+            critical=critical,
+            mode=op_mode,
+            blend_alpha=max(0.0, min(1.0, alpha)),
+            reason="practice_midband_supervised",
+        )
+
+    def supervised_blend(
+        self,
+        source: np.ndarray,
+        target: np.ndarray,
+        alpha: float,
+    ) -> np.ndarray:
+        """Manifold slerp from source toward target by alpha ∈ [0, 1].
+
+        Dual-correction surface on the Spin group (not Euclidean lerp):
+
+            R = word_transition_rotor(source, target)  # = target * reverse(source)
+            out = rotor_power(R, α) * source            # left composition
+
+        At α=0 → source; at α=1 → target (unit versors). Sandwich conjugation
+        would map the identity to itself and is the wrong geodesic for state
+        interpolation. Output must satisfy versor_condition < 1e-6.
+        """
+        a = float(alpha)
+        if a < 0.0 or a > 1.0:
+            raise ValueError("alpha must be in [0, 1]")
+        src = _as_mv(source, "source")
+        tgt = _as_mv(target, "target")
+        if a <= _NEAR_ZERO:
+            out = src.copy()
+        elif a >= 1.0 - _NEAR_ZERO:
+            out = tgt.copy()
+        else:
+            R = word_transition_rotor(src, tgt)
+            R_a = rotor_power(R, a)
+            out = geometric_product(R_a, src).astype(np.float64)
+
+        cond = versor_condition(out)
+        if cond >= _CLOSURE_TOL:
+            raise ValueError(
+                f"supervised_blend broke versor_condition: {cond:.3e} >= {_CLOSURE_TOL}"
+            )
+        return out.astype(np.float64, copy=False)
+
+    def telemetry(self) -> dict[str, Any]:
+        """Schema-versioned pure projection for workbench channels."""
+        fl = self.floor_state
+        return {
+            "schema_version": _TELEMETRY_SCHEMA,
+            "pseudoscalar_floor": float(fl.value),
+            "pseudoscalar_sign": float(fl.sign),
+            "n_samples": int(fl.n_samples),
+            "last_update_step": int(fl.last_update_step),
+            "primal_floor": float(fl.primal_floor),
+            "recent_residuals": list(fl.recent_residuals),
+            "config": {
+                "decay_N": int(self.config.decay_N),
+                "w_drift": float(self.config.w_drift),
+                "floor_init": float(self.config.floor_init),
+                "critical_ratio": float(self.config.critical_ratio),
+                "practice_autonomy_enabled": bool(self.config.practice_autonomy_enabled),
+                "serve_supervised_blend_authorized": bool(
+                    self.config.serve_supervised_blend_authorized
+                ),
+            },
+        }
+
+
+def with_config(monitor: GoldTetherMonitor, **updates: Any) -> GoldTetherMonitor:
+    """Return a new monitor with updated config (immutability-friendly)."""
+    cfg = replace(monitor.config, **updates)
+    m = GoldTetherMonitor(config=cfg)
+    m.floor_state = monitor.floor_state
+    m._step = monitor._step
+    return m
+
+
+def residual_from_mapping(payload: Mapping[str, Any]) -> float:
+    """Deterministic residual extract for telemetry/replay fixtures."""
+    if "combined" in payload:
+        return float(payload["combined"])
+    raise KeyError("payload missing combined residual")
diff --git a/core/physics/self_authorship.py b/core/physics/self_authorship.py
new file mode 100644
index 00000000..b2ac7b24
--- /dev/null
+++ b/core/physics/self_authorship.py
@@ -0,0 +1,190 @@
+"""core.physics.self_authorship — Self-Authorship Miner scaffold (ADR-0240).
+
+Geometry-guided ADR / teaching proposals under invariants. Emits
+**proposal-only** artifacts (SPECULATIVE). Never writes vault COHERENT,
+never mutates packs, never touches serving.
+
+Complements the existing auto-proposal corridor (ADR-0151). This miner
+produces structured proposal dicts; promotion remains human-reviewed.
+"""
+
+from __future__ import annotations
+
+import hashlib
+import json
+from dataclasses import dataclass
+from typing import Any, Mapping, Sequence
+
+import numpy as np
+
+from algebra.cl41 import N_COMPONENTS
+from algebra.versor import versor_condition
+from core.physics.dynamic_manifold import conformal_procrustes, signature_aware_pca
+from core.physics.goldtether import CoherenceResidual, GoldTetherMonitor, OperatingMode
+from core.physics.surprise import dual_operator, surprise_residual
+
+
+@dataclass(frozen=True, slots=True)
+class AuthorshipProposal:
+    """Proposal-only artifact — never auto-accepted."""
+
+    proposal_id: str
+    kind: str
+    epistemic_status: str  # always SPECULATIVE at emission
+    drift_residual: float
+    closure_proof: Mapping[str, Any]
+    body: Mapping[str, Any]
+    adr_refs: tuple[str, ...]
+
+    def as_dict(self) -> dict[str, Any]:
+        return {
+            "proposal_id": self.proposal_id,
+            "kind": self.kind,
+            "epistemic_status": self.epistemic_status,
+            "drift_residual": self.drift_residual,
+            "closure_proof": dict(self.closure_proof),
+            "body": dict(self.body),
+            "adr_refs": list(self.adr_refs),
+        }
+
+
+def _content_id(payload: Mapping[str, Any]) -> str:
+    raw = json.dumps(payload, sort_keys=True, separators=(",", ":"), default=str)
+    return hashlib.sha256(raw.encode("utf-8")).hexdigest()[:24]
+
+
+class SelfAuthorshipMiner:
+    """Mine minimal extension proposals from geometric residual structure."""
+
+    def __init__(
+        self,
+        *,
+        goldtether: GoldTetherMonitor | None = None,
+        residual_threshold: float = 0.25,
+    ) -> None:
+        self.goldtether = goldtether or GoldTetherMonitor()
+        self.residual_threshold = float(residual_threshold)
+
+    def mine_from_trajectory(
+        self,
+        current: np.ndarray,
+        reference: np.ndarray,
+        *,
+        basis: Sequence[np.ndarray] = (),
+        analogs: Sequence[tuple[str, np.ndarray, np.ndarray]] = (),
+        notes: str = "",
+    ) -> tuple[AuthorshipProposal, ...]:
+        """Emit zero or more SPECULATIVE proposals. Never stores them."""
+        cur = np.asarray(current, dtype=np.float64)
+        ref = np.asarray(reference, dtype=np.float64)
+        if cur.shape != (N_COMPONENTS,) or ref.shape != (N_COMPONENTS,):
+            raise ValueError("current and reference must be 32-component multivectors")
+
+        residual: CoherenceResidual = self.goldtether.measure(
+            cur, ref, mode=OperatingMode.PRACTICE
+        )
+        proposals: list[AuthorshipProposal] = []
+
+        # Closure proof for the reference/current pair under transition.
+        try:
+            proc = conformal_procrustes([ref], [cur])
+            closure_ok = versor_condition(proc.versor) < 1e-6
+            proc_res = float(proc.residual_norm)
+        except ValueError as exc:
+            closure_ok = False
+            proc_res = float("inf")
+            proc_err = str(exc)
+        else:
+            proc_err = ""
+
+        closure_proof = {
+            "versor_condition_current": float(versor_condition(cur)),
+            "versor_condition_reference": float(versor_condition(ref)),
+            "procrustes_residual": proc_res,
+            "procrustes_closed": closure_ok,
+            "procrustes_error": proc_err,
+            "coherence_combined": float(residual.combined),
+            "kappa": float(residual.kappa),
+        }
+
+        if residual.combined >= self.residual_threshold and closure_ok:
+            body = {
+                "notes": notes,
+                "suggested_action": "review_coherence_gap",
+                "drift": float(residual.drift),
+                "geometric_distance": float(residual.geometric_distance),
+            }
+            pid = _content_id({"kind": "coherence_gap", "body": body, "proof": closure_proof})
+            proposals.append(
+                AuthorshipProposal(
+                    proposal_id=f"selfauth-{pid}",
+                    kind="coherence_gap",
+                    epistemic_status="SPECULATIVE",
+                    drift_residual=float(residual.combined),
+                    closure_proof=closure_proof,
+                    body=body,
+                    adr_refs=("ADR-0238", "ADR-0240"),
+                )
+            )
+
+        if basis:
+            surp = surprise_residual(cur, basis)
+            dual = dual_operator(
+                cur,
+                basis,
+                analogs,
+                kappa=max(residual.kappa, 1e-6),
+            )
+            if dual.productive:
+                body = {
+                    "notes": notes,
+                    "suggested_action": "review_analogical_extension",
+                    "surprise_norm": float(surp.residual_norm),
+                    "selected_analog_id": dual.selected_analog_id,
+                    "procrustes_residual": (
+                        float(dual.procrustes.residual_norm) if dual.procrustes else None
+                    ),
+                }
+                pid = _content_id(
+                    {"kind": "analogical_extension", "body": body, "proof": closure_proof}
+                )
+                proposals.append(
+                    AuthorshipProposal(
+                        proposal_id=f"selfauth-{pid}",
+                        kind="analogical_extension",
+                        epistemic_status="SPECULATIVE",
+                        drift_residual=float(surp.residual_norm),
+                        closure_proof=closure_proof,
+                        body=body,
+                        adr_refs=("ADR-0239", "ADR-0240"),
+                    )
+                )
+
+        # Optional manifold annotation when a small cloud is available via analogs.
+        cloud = [ref, cur] + [s for _, s, _ in analogs] + [t for _, _, t in analogs]
+        if len(cloud) >= 2:
+            pca = signature_aware_pca(cloud, max_axes=4)
+            if pca.n_null > 0:
+                body = {
+                    "notes": notes,
+                    "suggested_action": "review_null_axes",
+                    "n_null": int(pca.n_null),
+                    "n_spacelike": int(pca.n_spacelike),
+                    "n_timelike": int(pca.n_timelike),
+                }
+                pid = _content_id({"kind": "null_axis_review", "body": body})
+                proposals.append(
+                    AuthorshipProposal(
+                        proposal_id=f"selfauth-{pid}",
+                        kind="null_axis_review",
+                        epistemic_status="SPECULATIVE",
+                        drift_residual=float(residual.combined),
+                        closure_proof=closure_proof,
+                        body=body,
+                        adr_refs=("ADR-0239", "ADR-0240"),
+                    )
+                )
+
+        # Stable order by proposal_id for replay-determinism.
+        proposals.sort(key=lambda p: p.proposal_id)
+        return tuple(proposals)
diff --git a/core/physics/surprise.py b/core/physics/surprise.py
new file mode 100644
index 00000000..7b638e03
--- /dev/null
+++ b/core/physics/surprise.py
@@ -0,0 +1,212 @@
+"""core.physics.surprise — Surprise Residual + dual with Procrustes (ADR-0239).
+
+Surprise Residual:  S(x) = x − proj_B(x)
+where B is a known basis (ordered multivector span). High surprise seeds
+Conformal Procrustes against vault analogs → productive novelty only when the
+post-transfer residual is below threshold; otherwise typed refuse.
+
+No sampling. No statistical ranking. Deterministic ordered analog lists.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Sequence
+
+import numpy as np
+
+from algebra.cl41 import N_COMPONENTS
+from algebra.versor import versor_condition
+from core.physics.dynamic_manifold import (
+    ConformalProcrustesResult,
+    conformal_procrustes,
+    procrustes_residual,
+)
+
+_NEAR_ZERO = 1e-12
+_CLOSURE_TOL = 1e-6
+_DEFAULT_PRODUCTIVE_THRESHOLD = 0.35
+
+
+@dataclass(frozen=True, slots=True)
+class SurpriseResult:
+    residual_mv: np.ndarray
+    residual_norm: float
+    projection: np.ndarray
+    basis_rank: int
+
+
+@dataclass(frozen=True, slots=True)
+class AnalogySeed:
+    analog_id: str
+    source: np.ndarray
+    target: np.ndarray
+    surprise_affinity: float
+
+
+@dataclass(frozen=True, slots=True)
+class DualOperatorResult:
+    surprise: SurpriseResult
+    procrustes: ConformalProcrustesResult | None
+    productive: bool
+    kappa: float
+    reason: str
+    selected_analog_id: str | None
+
+
+def _as_mv(v: np.ndarray, name: str) -> np.ndarray:
+    arr = np.asarray(v, dtype=np.float64)
+    if arr.shape != (N_COMPONENTS,):
+        raise ValueError(f"{name} must have shape ({N_COMPONENTS},); got {arr.shape}")
+    return arr
+
+
+def _orthonormalize_basis(basis: Sequence[np.ndarray]) -> np.ndarray:
+    """Deterministic Gram–Schmidt on coefficient space (ordered input).
+
+    Returns matrix B with shape (rank, 32). Zero / dependent vectors dropped
+    in order — not silently as "null PCA axes"; rank is reported.
+    """
+    cols: list[np.ndarray] = []
+    for i, b in enumerate(basis):
+        v = _as_mv(b, f"basis[{i}]").copy()
+        for u in cols:
+            v = v - float(np.dot(v, u)) * u
+        n = float(np.linalg.norm(v))
+        if n < _NEAR_ZERO:
+            continue
+        cols.append(v / n)
+    if not cols:
+        return np.zeros((0, N_COMPONENTS), dtype=np.float64)
+    return np.stack(cols, axis=0)
+
+
+def project_onto_basis(x: np.ndarray, basis: Sequence[np.ndarray]) -> np.ndarray:
+    """Orthogonal projection of x onto span(B) in coefficient space."""
+    x_arr = _as_mv(x, "x")
+    B = _orthonormalize_basis(basis)
+    if B.shape[0] == 0:
+        return np.zeros(N_COMPONENTS, dtype=np.float64)
+    # proj = sum_i <x, u_i> u_i
+    coeffs = B @ x_arr
+    return (B.T @ coeffs).astype(np.float64, copy=False)
+
+
+def surprise_residual(
+    x: np.ndarray,
+    basis: Sequence[np.ndarray],
+) -> SurpriseResult:
+    """S(x) = x − proj_B(x). Residual is orthogonal to span(B)."""
+    x_arr = _as_mv(x, "x")
+    proj = project_onto_basis(x_arr, basis)
+    residual = (x_arr - proj).astype(np.float64, copy=False)
+    B = _orthonormalize_basis(basis)
+    return SurpriseResult(
+        residual_mv=residual,
+        residual_norm=float(np.linalg.norm(residual)),
+        projection=proj,
+        basis_rank=int(B.shape[0]),
+    )
+
+
+def analogy_seed(
+    surprise: SurpriseResult,
+    analogs: Sequence[tuple[str, np.ndarray, np.ndarray]],
+    *,
+    top_k: int | None = None,
+) -> tuple[AnalogySeed, ...]:
+    """Rank vault analogs by affinity to the surprise residual (deterministic).
+
+    Affinity = |cos| between residual and (target − source) direction in
+    coefficient space. Higher affinity → better structural candidate.
+    Order is stable: affinity desc, then analog_id asc.
+    """
+    if surprise.residual_norm < _NEAR_ZERO:
+        return ()
+    r = surprise.residual_mv
+    r_n = surprise.residual_norm
+    seeds: list[AnalogySeed] = []
+    for item in analogs:
+        if len(item) != 3:
+            raise ValueError("each analog must be (id, source, target)")
+        aid, src, tgt = item
+        s = _as_mv(src, f"analog[{aid}].source")
+        t = _as_mv(tgt, f"analog[{aid}].target")
+        delta = t - s
+        dn = float(np.linalg.norm(delta))
+        if dn < _NEAR_ZERO:
+            aff = 0.0
+        else:
+            aff = abs(float(np.dot(r, delta)) / (r_n * dn))
+        seeds.append(
+            AnalogySeed(
+                analog_id=str(aid),
+                source=s,
+                target=t,
+                surprise_affinity=float(aff),
+            )
+        )
+    seeds.sort(key=lambda s: (-s.surprise_affinity, s.analog_id))
+    if top_k is not None:
+        seeds = seeds[: max(0, int(top_k))]
+    return tuple(seeds)
+
+
+def dual_operator(
+    x: np.ndarray,
+    basis: Sequence[np.ndarray],
+    analogs: Sequence[tuple[str, np.ndarray, np.ndarray]],
+    *,
+    kappa: float = 1.0,
+    productive_threshold: float = _DEFAULT_PRODUCTIVE_THRESHOLD,
+    min_surprise: float = 1e-6,
+) -> DualOperatorResult:
+    """Surprise + Procrustes dual.
+
+    High surprise seeds Procrustes against the best analog. Productive only when
+    post-transfer residual ≤ productive_threshold * (1/κ-scaled). κ from
+    CoherenceGoldTether scales the threshold (higher κ → stricter).
+    """
+    if kappa <= 0.0:
+        raise ValueError("kappa must be positive")
+    surprise = surprise_residual(x, basis)
+    if surprise.residual_norm < min_surprise:
+        return DualOperatorResult(
+            surprise=surprise,
+            procrustes=None,
+            productive=False,
+            kappa=float(kappa),
+            reason="surprise_below_minimum",
+            selected_analog_id=None,
+        )
+
+    seeds = analogy_seed(surprise, analogs, top_k=1)
+    if not seeds:
+        return DualOperatorResult(
+            surprise=surprise,
+            procrustes=None,
+            productive=False,
+            kappa=float(kappa),
+            reason="no_analogs",
+            selected_analog_id=None,
+        )
+
+    best = seeds[0]
+    # Transfer: Procrustes from analog source→target applied as structural map;
+    # measure residual of mapping x's projection-completion toward analog target shape.
+    proc = conformal_procrustes([best.source], [best.target])
+    # Residual of applying the analog's versor to x vs. the analog target direction.
+    transfer_res = procrustes_residual(x, best.target, proc.versor)
+    # Also include native procrustes residual of the analog pair itself.
+    residual = max(float(proc.residual_norm), float(transfer_res))
+    threshold = float(productive_threshold) / float(kappa)
+    productive = residual <= threshold and versor_condition(proc.versor) < _CLOSURE_TOL
+
+    return DualOperatorResult(
+        surprise=surprise,
+        procrustes=proc,
+        productive=bool(productive),
+        kappa=float(kappa),
+        reason="productive_novelty" if productive else "residual_above_threshold",
+        selected_analog_id=best.analog_id,
+    )
diff --git a/core/physics/temporal_gate.py b/core/physics/temporal_gate.py
new file mode 100644
index 00000000..ed814119
--- /dev/null
+++ b/core/physics/temporal_gate.py
@@ -0,0 +1,130 @@
+"""core.physics.temporal_gate — Temporal Admissibility Gate (ADR-0240).
+
+Wisdom as geometry: refuse premature but eventually-admissible claims with a
+typed NOT_YET. Never confabulates early. Pure predicate — no side effects.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from enum import Enum
+from typing import Any, Mapping
+
+
+class TemporalVerdict(str, Enum):
+    ADMIT = "admit"
+    NOT_YET = "not_yet"
+    REFUSE = "refuse"
+
+
+@dataclass(frozen=True, slots=True)
+class TemporalContext:
+    """Geometric/temporal preconditions for a claim.
+
+    All fields are explicit; missing evidence is not inventable.
+    """
+
+    step: int
+    min_step: int = 0
+    required_evidence_count: int = 0
+    evidence_count: int = 0
+    coherence_residual: float = 0.0
+    residual_ceiling: float = 1.0
+    prerequisites_met: bool = True
+    claim_id: str = ""
+
+
+@dataclass(frozen=True, slots=True)
+class TemporalDecision:
+    verdict: TemporalVerdict
+    reason: str
+    claim_id: str
+    disclosure: Mapping[str, Any]
+
+
+class TemporalAdmissibilityGate:
+    """Pure temporal admissibility checks."""
+
+    def __init__(
+        self,
+        *,
+        require_prerequisites: bool = True,
+        enforce_residual_ceiling: bool = True,
+    ) -> None:
+        self.require_prerequisites = bool(require_prerequisites)
+        self.enforce_residual_ceiling = bool(enforce_residual_ceiling)
+
+    def evaluate(self, ctx: TemporalContext) -> TemporalDecision:
+        cid = str(ctx.claim_id)
+
+        if ctx.step < 0 or ctx.min_step < 0:
+            return TemporalDecision(
+                verdict=TemporalVerdict.REFUSE,
+                reason="negative_time_index",
+                claim_id=cid,
+                disclosure={
+                    "type": "temporal_refuse",
+                    "detail": "time indices must be non-negative",
+                },
+            )
+
+        if self.require_prerequisites and not ctx.prerequisites_met:
+            return TemporalDecision(
+                verdict=TemporalVerdict.REFUSE,
+                reason="prerequisites_unmet",
+                claim_id=cid,
+                disclosure={
+                    "type": "temporal_refuse",
+                    "detail": "required prerequisites are not met",
+                },
+            )
+
+        if self.enforce_residual_ceiling and ctx.coherence_residual > ctx.residual_ceiling:
+            return TemporalDecision(
+                verdict=TemporalVerdict.REFUSE,
+                reason="residual_above_ceiling",
+                claim_id=cid,
+                disclosure={
+                    "type": "temporal_refuse",
+                    "detail": "coherence residual exceeds ceiling",
+                    "residual": float(ctx.coherence_residual),
+                    "ceiling": float(ctx.residual_ceiling),
+                },
+            )
+
+        if ctx.step < ctx.min_step:
+            return TemporalDecision(
+                verdict=TemporalVerdict.NOT_YET,
+                reason="before_min_step",
+                claim_id=cid,
+                disclosure={
+                    "type": "temporal_not_yet",
+                    "detail": "fullness of time not reached",
+                    "step": int(ctx.step),
+                    "min_step": int(ctx.min_step),
+                },
+            )
+
+        if ctx.evidence_count < ctx.required_evidence_count:
+            return TemporalDecision(
+                verdict=TemporalVerdict.NOT_YET,
+                reason="insufficient_evidence",
+                claim_id=cid,
+                disclosure={
+                    "type": "temporal_not_yet",
+                    "detail": "evidence count below required floor",
+                    "evidence_count": int(ctx.evidence_count),
+                    "required_evidence_count": int(ctx.required_evidence_count),
+                },
+            )
+
+        return TemporalDecision(
+            verdict=TemporalVerdict.ADMIT,
+            reason="temporally_admissible",
+            claim_id=cid,
+            disclosure={
+                "type": "temporal_admit",
+                "step": int(ctx.step),
+                "evidence_count": int(ctx.evidence_count),
+            },
+        )