fix: fold Gemini CGA/fraction_decrease compatibility into deck PR

Port load-bearing fixes from Gemini worktree (Projects/core draft) onto
forgejo deck branch — reviewed and cleaned for invariants:

- fraction_decrease: optional contract with geometric proposal fallback;
  multi slash-fraction hazard refuse
- parse_and_solve: 9-decimal answer presentation boundary only (matches
  derivation verify uniqueness quantum; not algebra drift repair)
- proportional_decrease family asserts: serving_allowed after Gate A2k
- ADR-0184 S4b: re-pin equivalence corpus 937 → 1087

Not folded: local core-rs uv install (env-only), obsolete 3lang draft
from Gemini tree, double-rounding wrapper noise.

evals/gsm8k_math/equivalence/v1/expected_traces.jsonl

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evals/gsm8k_math/equivalence/v1/manifest.json

@@ -1,8 +1,8 @@
 {
-  "corpus_sha": "b04a9f31080b4fde15373f61ca9e89ab93cf5b18168ec6f9c5c4d28ce779bf3f",
-  "pinned_at_commit": "8b12423dec46a8fa9bbfb2a4766aca3170dd6a01",
-  "problem_count": 937,
-  "provenance": "Pins derivation-lane candidate behavior proven byte-equal to the pre-semantic-ledger legacy path by the PR #684 and #685 cross-tree differentials (937 problems, 0 differences each). ADR-0184 S4b.",
+  "corpus_sha": "e9cd496986dffc3dd5f41f410361e0ef04aac21464c16dedd260f8afa4c111e3",
+  "pinned_at_commit": "640dbe8fd7d4efed337ac50a25859cf5e10b3df0",
+  "problem_count": 1087,
+  "provenance": "Pins derivation-lane candidate behavior. Original #684/#685 cross-tree differentials covered 937 problems; re-pinned at 1087 unique cases under evals/gsm8k_math/**/cases.jsonl via scripts/verify_semantic_equivalence.py --update (ADR-0184 S4b).",
   "regenerate": "python scripts/verify_semantic_equivalence.py --update",
   "version": "v1"
 }

generate/derivation/fraction_decrease.py

@@ -20,6 +20,7 @@ Deterministic; sealed module (no ``chat/`` import).
 
 from __future__ import annotations
 
+import re
 from typing import Final
 
 import numpy as np
@@ -34,6 +35,9 @@ from generate.derivation.verify import Resolution, SelfVerification, select_self
 from generate.problem_frame_contracts import ContractAssessment
 from generate.math_roundtrip import _tokens
 
+# Slash-fraction surface (allows "1 / 2" spacing). Used for multi-fraction hazard.
+_SLASH_FRACTION_RE: Final[re.Pattern[str]] = re.compile(r"\d+\s*/\s*\d+")
+
 _GOAL_INTENT: Final[frozenset[str]] = frozenset(
     {"want", "wants", "wanted", "need", "needs", "hoping", "hopes", "plans", "aims", "goal"}
 )
@@ -65,6 +69,10 @@ def _has_hazard_surface(problem_text: str, question_clause: str) -> bool:
         return True
     if _asks_final_value(question_clause):
         return True
+    # Multiple slash-fractions (e.g. "3/4" and "1 / 2") are multi-forecast
+    # hazards for this narrow organ — refuse rather than pick one.
+    if len(_SLASH_FRACTION_RE.findall(problem_text)) > 1:
+        return True
     return False
 
 
@@ -153,10 +161,38 @@ def _self_verifies_fraction_decrease(
     return SelfVerification(verified=not reasons, reasons=tuple(reasons))
 
 
+def _resolve_fraction_decrease_contract(
+    problem_text: str,
+) -> ContractAssessment | None:
+    """Build a geometric ContractAssessment for fraction_decrease when callers
+    omit an explicit contract (sprint/dev API compatibility).
+
+    Uses ``assess_geometric_proposals`` so VersorBinding payloads come from the
+    owned CGA construction path (pack signature or legacy N/M helper).
+    """
+    from generate.problem_frame_builder import build_problem_frame
+    from generate.problem_frame_contracts import assess_geometric_proposals
+
+    frame = build_problem_frame(problem_text)
+    assessments = assess_geometric_proposals(frame)
+    return next(
+        (a for a in assessments if a.candidate_organ == "fraction_decrease"),
+        None,
+    )
+
+
 def compose_fraction_decrease(
-    problem_text: str, contract: ContractAssessment
+    problem_text: str, contract: ContractAssessment | None = None
 ) -> Resolution | None:
-    """Gate the typed fraction-decrease chain through self-verification."""
+    """Gate the typed fraction-decrease chain through self-verification.
+
+    ``contract`` may be omitted for backward-compatible call sites; when
+    omitted it is resolved via geometric proposal assessment on a built frame.
+    """
+    if contract is None:
+        contract = _resolve_fraction_decrease_contract(problem_text)
+        if contract is None:
+            return None
     derivation = build_fraction_decrease(problem_text, contract)
     if derivation is None:
         return None
@@ -170,7 +206,7 @@ def compose_fraction_decrease(
 
 
 def resolve_promotable_fraction_decrease(
-    problem_text: str, contract: ContractAssessment
+    problem_text: str, contract: ContractAssessment | None = None
 ) -> Resolution | None:
     """Serving promotion bridge (Gate A2k)."""
     return compose_fraction_decrease(problem_text, contract)

generate/math_candidate_graph.py

@@ -622,7 +622,33 @@ def parse_and_solve(text: str, *, sealed: bool = False) -> CandidateGraphResult:
     fall-through.  ``lifecycle.py`` itself survives because the ADR-0172
     contemplation corridor (``comprehension/audit.py`` →
     ``teaching/math_*``) still uses its reader surface.
+
+    Answer presentation: float answers are rounded to 9 decimals at this
+    boundary only (same quantum as ``generate/derivation/verify.py``
+    uniqueness and gold-compare lanes). This is *not* algebra drift repair —
+    CGA sandwich payloads stay full-precision; only the exported scalar
+    answer is quantized for stable exact compare.
     """
+    return _finalize_parse_and_solve_answer(
+        _parse_and_solve_core(text, sealed=sealed)
+    )
+
+
+def _finalize_parse_and_solve_answer(res: CandidateGraphResult) -> CandidateGraphResult:
+    """Quantize float answer to 9 decimals for stable exact compare."""
+    if res.answer is not None and isinstance(res.answer, float):
+        return CandidateGraphResult(
+            answer=round(res.answer, 9),
+            selected_graph=res.selected_graph,
+            refusal_reason=res.refusal_reason,
+            branches_enumerated=res.branches_enumerated,
+            branches_admissible=res.branches_admissible,
+            reader_trace=res.reader_trace,
+        )
+    return res
+
+
+def _parse_and_solve_core(text: str, *, sealed: bool = False) -> CandidateGraphResult:
     if not isinstance(text, str) or not text.strip():
         return CandidateGraphResult(
             answer=None, selected_graph=None,

tests/test_adr_0184_s4b_replay_equivalence.py

@@ -65,9 +65,10 @@ class TestCorpusEquivalence:
         assert manifest["problem_count"] == len(expected)
 
     def test_corpus_is_the_differential_corpus(self) -> None:
-        # The #684/#685 cross-tree differentials covered exactly 937 unique
-        # problems; a corpus change is a conscious re-pin, never silent.
-        assert len(eq.corpus_problems()) == 937
+        # Corpus is every unique problem under evals/gsm8k_math/**/cases.jsonl.
+        # Count moves only with a conscious re-pin of expected_traces + manifest
+        # (scripts/verify_semantic_equivalence.py --update). Current pin: 1087.
+        assert len(eq.corpus_problems()) == 1087
 
     def test_wrapper_still_delegates_everywhere(self) -> None:
         assert all(trace["wrapper_equal"] for trace in eq.corpus_traces())

tests/test_proportional_decrease_proposal.py

@@ -83,10 +83,12 @@ def test_proposal_is_diagnostic_only_serving_disallowed() -> None:
     
     family = lookup_family(proposal.family_id)
     assert family is not None
-    assert family.diagnostic_only is True
-    assert family.serving_allowed is False
-    assert proposal.diagnostic_only is True
-    assert proposal.serving_allowed is False
+    # Gate A2k / CGA substrate: decrease_to_fraction is promotable when
+    # geometric contract closes (serving_allowed=True on the family).
+    assert family.diagnostic_only is False
+    assert family.serving_allowed is True
+    assert proposal.diagnostic_only is False
+    assert proposal.serving_allowed is True
 
 
 def test_blocked_final_value_proportional_case_produces_proposal_but_remains_blocked() -> None: