core/chat/pack_grounding.py

"""chat/pack_grounding.py — pack-grounded surface for cold-start DEFINITION
and RECALL intents (ADR-0048).

When the ``UnknownDomainGate`` fires with ``source="empty_vault"`` — i.e.
the runtime has no session evidence yet — the runtime would otherwise
emit the universal ``_UNKNOWN_DOMAIN_SURFACE`` disclosure on every turn,
including for terms that are explicitly compiled into the ratified
cognition pack.

This module supplies a narrow, auditable alternative: when the input's
intent is ``DEFINITION`` or ``RECALL`` AND the intent's subject lemma is
present in ``en_core_cognition_v1``, return a deterministic surface
composed from the pack lexicon's ``semantic_domains`` for that lemma,
explicitly tagged as pack-sourced.

Design constraints (matching the seven axioms):

- Geometry-first: the pack lookup is by lemma surface, but the
  ``semantic_domains`` were curated against the same versors the
  vocabulary carries; the surface refers only to the lemma and its
  curated descriptors — no synthesis, no LLM fallback.
- Reconstruction-over-storage: the surface is reconstructed from the
  pack at call time; the lexicon is loaded once and cached because
  ratified packs are immutable.
- Dual-correction: any lemma not in the pack returns ``None``;
  callers fall through to ``_UNKNOWN_DOMAIN_SURFACE`` unchanged.
- Compilation-last: no tensors, no kernels — JSONL read and string
  formatting only.
- Trust boundary: every surface produced here is explicitly tagged
  ``pack:en_core_cognition_v1`` so the audit contract distinguishes
  pack-grounded surfaces from vault-grounded surfaces and from the
  universal disclosure.
"""

from __future__ import annotations

import json
from functools import lru_cache
from pathlib import Path

PACK_ID: str = "en_core_cognition_v1"

_PACK_LEXICON_PATH = (
    Path(__file__).resolve().parent.parent
    / "language_packs"
    / "data"
    / PACK_ID
    / "lexicon.jsonl"
)


@lru_cache(maxsize=1)
def _pack_index() -> dict[str, tuple[str, ...]]:
    """Load the cognition pack lexicon once and return ``{lemma: semantic_domains}``.

    Ratified packs are immutable; safe to cache for the process lifetime.
    Returns an empty dict if the pack is unavailable — callers must treat
    a missing pack as "no pack-grounded surface available."
    """
    if not _PACK_LEXICON_PATH.exists():
        return {}
    out: dict[str, tuple[str, ...]] = {}
    for line in _PACK_LEXICON_PATH.read_text(encoding="utf-8").splitlines():
        line = line.strip()
        if not line:
            continue
        try:
            entry = json.loads(line)
        except json.JSONDecodeError:
            continue
        lemma = entry.get("lemma") or entry.get("surface")
        if not lemma:
            continue
        domains = tuple(entry.get("semantic_domains", ()))
        if domains:
            out[lemma.lower()] = domains
    return out


def pack_grounded_surface(lemma: str) -> str | None:
    """Return a deterministic pack-grounded surface for *lemma*, or ``None``.

    The surface format is fixed:

        "{lemma} — pack-grounded ({pack_id}): {d1}; {d2}; {d3}. No session evidence yet."

    Only the lemma and up to three semantic_domains from the pack are
    emitted; both come directly from the ratified pack lexicon, with no
    rewording.  The trailing disclosure is the constant trust-boundary
    label that distinguishes pack-grounded surfaces from vault-grounded
    surfaces (which would carry session evidence) and from the universal
    "insufficient grounding" disclosure (which carries neither).

    Returns ``None`` when:
      - the lemma is empty or not a string,
      - the pack lexicon file is unavailable,
      - the lemma is not present in the pack,
      - the pack entry has no ``semantic_domains``.
    """
    if not lemma or not isinstance(lemma, str):
        return None
    key = lemma.strip().lower()
    if not key:
        return None
    index = _pack_index()
    domains = index.get(key)
    if not domains:
        return None
    head = "; ".join(domains[:3])
    return (
        f"{key} — pack-grounded ({PACK_ID}): {head}. "
        f"No session evidence yet."
    )


def is_pack_lemma(lemma: str) -> bool:
    """Return True iff *lemma* has an entry with ``semantic_domains`` in the pack."""
    if not lemma or not isinstance(lemma, str):
        return False
    return lemma.strip().lower() in _pack_index()


def pack_grounded_correction_surface() -> str | None:
    """ADR-0053 — cold-start CORRECTION acknowledgement.

    A CORRECTION intent (``"No, that's wrong"``, ``"Actually, X means Y"``)
    is meta-cognitive: it claims the previous turn was incorrect.  On a
    cold-start session there is no prior turn to apply the correction
    to, so the doctrine-aligned response is **not** to define what
    correction is (that would be the DEFINITION path) but to
    acknowledge receipt and state explicitly that no prior turn exists
    in this session.

    Surface format (fixed template, all atoms pack-sourced):

        "correction received — pack-grounded ({pack_id}): {d1}; {d2}; {d3}.
         No prior turn in this session to correct yet."

    Every visible non-template token is either the lemma ``correction``
    or a verbatim ``semantic_domains`` string from the ratified pack.
    The trailing disclosure (``No prior turn in this session to correct
    yet.``) is the constant trust-boundary label distinguishing this
    cold-start acknowledgement from the post-correction teaching
    repair path (``teaching/correction.py``) which engages once a
    prior turn exists.

    Returns ``None`` if the pack is unavailable or has no entry for
    ``correction`` — callers fall through to the universal disclosure
    unchanged.
    """
    index = _pack_index()
    domains = index.get("correction")
    if not domains:
        return None
    head = "; ".join(domains[:3])
    return (
        f"correction received — pack-grounded ({PACK_ID}): {head}. "
        f"No prior turn in this session to correct yet."
    )


def pack_grounded_comparison_surface(
    lemma_a: str, lemma_b: str
) -> str | None:
    """ADR-0050 — deterministic pack-grounded surface for COMPARISON intent.

    Returns a surface that composes each lemma's pack semantic_domains
    side-by-side, with no rewording or inference:

        "{a} (d_a1; d_a2) contrasts with {b} (d_b1; d_b2) — pack-grounded
         ({pack_id}). No session evidence yet."

    Up to two semantic_domains per side are emitted to keep the surface
    compact.  All visible tokens are either the lemmas themselves or
    verbatim pack strings; the verb "contrasts with" is the fixed
    COMPARISON template constant (mirroring the relation predicate
    `contrasts_with` already humanised by ``humanize_predicate``).

    Returns ``None`` when:
      - either lemma is empty or not a string,
      - either lemma is not present in the pack,
      - the two lemmas are identical (a comparison between a term
        and itself carries no contrastive evidence — defer to the
        single-lemma ``pack_grounded_surface`` path or to the
        universal disclosure).
    """
    if not lemma_a or not isinstance(lemma_a, str):
        return None
    if not lemma_b or not isinstance(lemma_b, str):
        return None
    key_a = lemma_a.strip().lower()
    key_b = lemma_b.strip().lower()
    if not key_a or not key_b:
        return None
    if key_a == key_b:
        return None
    index = _pack_index()
    domains_a = index.get(key_a)
    domains_b = index.get(key_b)
    if not domains_a or not domains_b:
        return None
    head_a = "; ".join(domains_a[:2])
    head_b = "; ".join(domains_b[:2])
    return (
        f"{key_a} ({head_a}) contrasts with {key_b} ({head_b}) "
        f"— pack-grounded ({PACK_ID}). No session evidence yet."
    )