fix(gsm8k): tighten Gate A1 N-times factors and confuser tests

Restrict comparative matcher N-times factors to plain digits and
single-word cardinals; refuse money, slash-fraction, hyphenated, and
indefinite surfaces. Strengthen confuser tests to assert empty injection
for any recognizer category; add graph-level refusal checks. Add Gate A1
lookback doc and EOF hygiene fixes.

docs/analysis/gsm8k-workstream-a-gate-a1-comparative-multiplicative-lookback-2026-06-17.md

@@ -0,0 +1,130 @@
+# GSM8K Workstream A Gate A1 — multiplicative comparative injection lookback
+
+**Date:** 2026-06-17 (post-implementation evidence closure)
+**Branch:** `feat/gsm8k-workstream-a-gate-a1-comparative-multiplicative-injection`
+**Head (implementation + patch):** `11abb9d572e26cb8feb57063827eda39f9279bd7`
+**Base implementation commit:** `e578ec72`
+**Governing ratification:** `docs/analysis/gsm8k-workstream-a-gate-a1-comparative-multiplicative-ratification-2026-06-17.md` (merged #803)
+**Scope:** **First subfamily only** — multiplicative entity comparison with explicit same-sentence reference. Additive comparative (Gate A2) deferred.
+
+## What shipped
+
+Gate A1 closes the `COMPARATIVE_WITH_UNIT` recognizer-anchor injector frontier for the closed v1 template family:
+
+- `twice/thrice/<N> times/half/a quarter/a third as many <unit> as <Reference>`
+- Emits existing `CandidateOperation(kind="compare_multiplicative", operand=Comparison(...))`
+- DCS yield guard routes comparative surfaces away from detection-only discrete-count fallback
+- N-times factor narrowness: plain digit or single-word cardinal only (no money, slash-fraction, hyphenated, indefinite)
+
+### Exact semantic path
+
+1. **Matcher** (`generate/recognizer_match.py`): `_match_comparative_with_unit` + `_parse_comparative_v1_count_factor` on the N-times branch.
+2. **Injector** (`generate/recognizer_anchor_inject.py`): `inject_comparative_multiplicative` reuses `_build_compare_multiplicative` + `roundtrip_admissible`.
+3. **Registry** (`teaching/admissibility_exemplars/comparative_with_unit_v1.jsonl` + accepted proposal `bec14058…`).
+4. **DCS yield** (`_match_discrete_count_statement`): returns `None` when `_is_comparative_multiplicative_v1_surface` holds.
+
+No solver semantic changes. No `report.json` rebaseline. No sealed-lane movement.
+
+## Changed files (implementation + patch)
+
+| File | Role |
+|------|------|
+| `generate/recognizer_match.py` | Matcher + v1 count-factor narrowness + DCS yield |
+| `generate/recognizer_anchor_inject.py` | Injector + `_INJECTORS` registration |
+| `teaching/recognizer_synthesis.py` | `_synthesize_comparative_with_unit` |
+| `teaching/exemplar_ingest.py` | Validator + supported category |
+| `teaching/admissibility_exemplars/comparative_with_unit_v1.jsonl` | 12 exemplars |
+| `teaching/proposals/proposals.jsonl` | Created + accepted recognizer proposal |
+| `teaching/cognition_chains/cognition_chains_v1.jsonl` | Corpus append from accept |
+| `tests/test_recognizer_comparative_inject.py` | Unit + confuser + graph tests |
+| `tests/test_gsm8k_frontier_report.py` | Live `comparative_with_unit` no-injection = 0 |
+
+## Tests run (patch)
+
+```bash
+git diff --check origin/main...HEAD
+.venv/bin/python -m pytest tests/test_recognizer_comparative_inject.py -q
+.venv/bin/python -m pytest tests/test_gsm8k_frontier_report.py -q
+.venv/bin/python -m pytest tests/test_candidate_graph_recognizer_wiring.py -q
+.venv/bin/python -m pytest tests/test_candidate_graph_completeness_guard.py -q
+.venv/bin/python -m pytest tests/test_adr_0131_G2_comparatives.py -q
+.venv/bin/python -m pytest tests/test_recognizer_anchor_inject.py -q
+.venv/bin/python -m pytest tests/test_math_candidate_graph_rate_injection.py -q
+.venv/bin/python -m core test --suite smoke -q
+```
+
+## Measurement truth (pinned vs live)
+
+### Pinned committed artifact (unchanged)
+
+`evals/gsm8k_math/train_sample/v1/report.json` remains the **Inc1-era / pre-Gate-A1** artifact:
+
+- **6 correct / 44 refused / 0 wrong**
+- No `comparative_with_unit` category in pinned no-injection bucket (category did not exist on serving path; comparative-bearing stmts appeared under `discrete_count_statement` no-injection)
+
+**Not rebaselined** — intentional per ratification §9.
+
+### Live ephemeral runner (current code)
+
+`build_report(cases)` on Gate A1 head (ephemeral; no `report.json` write):
+
+| Metric | Before Gate A1 (main @ ed2d04c9) | After Gate A1 |
+|--------|----------------------------------|---------------|
+| correct | 6 | 6 |
+| refused | 44 | 44 |
+| wrong | 0 | 0 |
+| `comparative_with_unit` no-injection | N/A (not on serving path) | **0** |
+| total `recognized_no_injection` | 31 | **31** |
+
+Live `recognized_no_injection_by_category` (post-Gate A1):
+
+- `discrete_count_statement: 19`
+- `temporal_aggregation: 2`
+- `multiplicative_aggregation: 3`
+- `descriptive_setup_no_quantity: 4`
+- `currency_amount: 3`
+
+**Interpretation:** injector frontier for `comparative_with_unit` is closed (mirror Inc3 rate lesson). Aggregate proxy unchanged; refusal family reclassification expected over time as comparative-bearing stmts move off DCS misroutes.
+
+## wrong=0
+
+- Live ephemeral runner: `wrong: 0`
+- Proposal replay at accept: `wrong_count_delta: 0`
+- Confuser suite: money/slash-fraction/indefinite N-times factors refuse at matcher; any recognizer match must emit `inject_from_match() == ()`
+
+## Explicit non-changes
+
+- No `report.json` rebaseline
+- No additive comparative (`compare_additive`) — Gate A2
+- No `double` / `one-third` / hyphenated N-times factors
+- No sealed-lane movement
+- No solver `_apply_compare_multiplicative` semantic change
+- No `determine()` / FrameVerdict / CLOSE interaction
+
+## Known caveats
+
+1. **Not full Gate A1 family** — multiplicative entity-comparison subfamily only; additive deferred to Gate A2.
+2. **No guaranteed correct-count lift** — monotonic contract holds (`correct>=6`, `refused<=44`); primary deliverable is injector closure + reclassification visibility.
+3. **DCS/parser path for bare `Jerry has 3 times`** — standalone no-reference surface may still interact with parser initials on some question shapes; Gate A1 injector refuses; completeness guard covers multi-clause confabulation class. Not claimed solved in this slice.
+4. **Matcher regex vs factor narrowness** — `_COMPARE_MULT_NTIMES_RE` still uses broad `_VALUE` at template level; extraction refuses unsafe factors via `_parse_comparative_v1_count_factor`.
+5. **Pinned frontier tests** — historical `report.json` fixture unchanged; live behavior tested ephemerally.
+
+## Deferred work (Gate A1b / A2)
+
+- `double`, `one-third`, `as much`, unit ellipsis
+- Additive comparative injection
+- Cross-sentence / pronoun reference (ADR-0138)
+- Nested comparative composition
+- Hyphenated N-times cardinals (e.g. `twenty-five times`) if ratified separately
+- `report.json` rebaseline only via separate ratified PR
+
+## Loop-closure criterion
+
+Gate A1 implementation loop is **closed** when:
+
+1. Ratification #803 merged (**done**)
+2. Test doctrine #804 merged (**done**)
+3. Matcher + injector + exemplars + accepted proposal on serving path (**done**)
+4. `comparative_with_unit` live no-injection = 0 (**done**)
+5. `wrong=0` on exercised lanes (**done**)
+6. This lookback doc lands with patch (**this PR**)

generate/recognizer_match.py

@@ -1844,13 +1844,42 @@ from generate.math_candidate_parser import (  # noqa: E402
     _COMPARE_MULT_ANCHOR_RE,
     _COMPARE_MULT_NTIMES_RE,
     _is_indefinite_quantifier,
-    _resolve_value,
 )
+from generate.math_roundtrip import WORD_NUMBERS  # noqa: E402
 
 _DEFERRED_COMPARATIVE_FACTOR_SURFACES: Final[frozenset[str]] = frozenset({
     "double", "triple", "quadruple", "one-third",
 })
 
+_COMPARATIVE_V1_CURRENCY_PREFIXES: Final[frozenset[str]] = frozenset({
+    "$", "£", "€", "¥", "¢", "₱",
+})
+
+
+def _parse_comparative_v1_count_factor(value_raw: str) -> float | None:
+    """Gate A1 v1 N-times factor narrowness: plain digit or single-word cardinal.
+
+    Refuses money, slash-fraction, hyphenated, decimal, and indefinite
+    quantifier surfaces that the broader parser ``_VALUE`` slot admits.
+    """
+    t = value_raw.strip()
+    if not t:
+        return None
+    if _is_indefinite_quantifier(t):
+        return None
+    if t[0] in _COMPARATIVE_V1_CURRENCY_PREFIXES:
+        return None
+    if "/" in t or "-" in t or "." in t:
+        return None
+    if t.isdigit():
+        v = int(t)
+        return float(v) if v > 0 else None
+    lower = t.lower()
+    if lower in WORD_NUMBERS:
+        v = WORD_NUMBERS[lower]
+        return float(v) if v > 0 else None
+    return None
+
 
 def _is_comparative_multiplicative_v1_surface(statement: str) -> bool:
     """True when *statement* matches the Gate A1 closed comparative template."""
@@ -1898,10 +1927,8 @@ def _try_extract_comparative_multiplicative_anchor(
         if not allows_numeric:
             return None
         value_raw = m.group("value")
-        if _is_indefinite_quantifier(value_raw):
+        factor = _parse_comparative_v1_count_factor(value_raw)
-            return None
+        if factor is None:
-        rv = _resolve_value(value_raw)
-        if rv is None or rv.value <= 0:
             return None
         actor_token = m.group("actor")
         unit_token = m.group("unit")
@@ -1913,7 +1940,7 @@ def _try_extract_comparative_multiplicative_anchor(
             "reference_actor_token": reference_token,
             "unit_token": unit_token,
             "factor_token": value_raw,
-            "factor": float(rv.value),
+            "factor": factor,
             "direction": "times",
             "matched_verb": "times",
             "comparator_phrase": phrase,

teaching/admissibility_exemplars/comparative_with_unit_v1.jsonl

@@ -9,4 +9,4 @@
 {"exemplar_id": "cwu-v1-0009", "shape_category": "comparative_with_unit", "statement": "Ivan has 3 times as many cards as Jerry.", "expected_graph": {"subject": "Ivan", "quantity_anchors": [{"kind": "comparative_multiplicative", "subject_role": "Ivan", "factor_token": "3", "factor_kind": "numeric", "direction": "times", "unit_token": "cards", "reference_actor_token": "Jerry"}], "graph_intent": "compare", "outcome": "admissible"}, "provenance": {"source": "gate_a1_seed", "author": "Grok (Gate A1)", "round": 1, "category_rank": 3}}
 {"exemplar_id": "cwu-v1-0010", "shape_category": "comparative_with_unit", "statement": "Kira gained twice as many points as Leo.", "expected_graph": {"subject": "Kira", "quantity_anchors": [{"kind": "comparative_multiplicative", "subject_role": "Kira", "factor_token": "twice", "factor_kind": "anchor", "direction": "times", "unit_token": "points", "reference_actor_token": "Leo"}], "graph_intent": "compare", "outcome": "admissible"}, "provenance": {"source": "gate_a1_seed", "author": "Grok (Gate A1)", "round": 1, "category_rank": 3}}
 {"exemplar_id": "cwu-v1-0011", "shape_category": "comparative_with_unit", "statement": "Nina studied three times as many pages as Omar.", "expected_graph": {"subject": "Nina", "quantity_anchors": [{"kind": "comparative_multiplicative", "subject_role": "Nina", "factor_token": "three", "factor_kind": "numeric", "direction": "times", "unit_token": "pages", "reference_actor_token": "Omar"}], "graph_intent": "compare", "outcome": "admissible"}, "provenance": {"source": "gate_a1_seed", "author": "Grok (Gate A1)", "round": 1, "category_rank": 3}}
-{"exemplar_id": "cwu-v1-0012", "shape_category": "comparative_with_unit", "statement": "Paula has half as many marbles as Quinn.", "expected_graph": {"subject": "Paula", "quantity_anchors": [{"kind": "comparative_multiplicative", "subject_role": "Paula", "factor_token": "half", "factor_kind": "anchor", "direction": "fraction", "unit_token": "marbles", "reference_actor_token": "Quinn"}], "graph_intent": "compare", "outcome": "admissible"}, "provenance": {"source": "gate_a1_seed", "author": "Grok (Gate A1)", "round": 1, "category_rank": 3}}
+{"exemplar_id": "cwu-v1-0012", "shape_category": "comparative_with_unit", "statement": "Paula has half as many marbles as Quinn.", "expected_graph": {"subject": "Paula", "quantity_anchors": [{"kind": "comparative_multiplicative", "subject_role": "Paula", "factor_token": "half", "factor_kind": "anchor", "direction": "fraction", "unit_token": "marbles", "reference_actor_token": "Quinn"}], "graph_intent": "compare", "outcome": "admissible"}, "provenance": {"source": "gate_a1_seed", "author": "Grok (Gate A1)", "round": 1, "category_rank": 3}}

tests/test_recognizer_comparative_inject.py

@@ -11,6 +11,7 @@ import types
 import pytest
 
 from evals.refusal_taxonomy.shape_categories import ShapeCategory
+from generate.math_candidate_graph import parse_and_solve
 from generate.math_candidate_parser import CandidateOperation
 from generate.math_problem_graph import Comparison
 from generate.math_roundtrip import roundtrip_admissible
@@ -106,16 +107,49 @@ def test_positive_surfaces_emit_compare_multiplicative(
         "Alice has one-third as many apples as Bob.",
         "Alice has double as many apples as Bob.",
         "Jerry has 3 times",
+        "Alice has $2 times as many apples as Bob.",
+        "Alice has 3/4 times as many apples as Bob.",
+        "Alice has some times as many apples as Bob.",
+        "Alice has twenty-five times as many apples as Bob.",
     ],
 )
 def test_confuser_surfaces_refuse_injection(sentence: str):
     registry = load_ratified_registry()
     m = match(sentence, registry)
-    if m is None or m.category is not ShapeCategory.COMPARATIVE_WITH_UNIT:
+    if m is None:
         return
     assert inject_from_match(m, sentence, sealed=False) == ()
 
 
+@pytest.mark.parametrize(
+    "sentence",
+    [
+        "Alice has $2 times as many apples as Bob.",
+        "Alice has 3/4 times as many apples as Bob.",
+        "Alice has some times as many apples as Bob.",
+        "Alice has twenty-five times as many apples as Bob.",
+    ],
+)
+def test_ntimes_factor_confusers_do_not_match_comparative(sentence: str):
+    registry = load_ratified_registry()
+    m = match(sentence, registry)
+    assert m is None or m.category is not ShapeCategory.COMPARATIVE_WITH_UNIT
+
+
+@pytest.mark.parametrize(
+    "text",
+    [
+        "Jerry has 3 times as many apples. How many apples does Jerry have?",
+        "Alice has $2 times as many apples as Bob. How many apples does Alice have?",
+        "Alice has 3 more apples than Bob. How many apples does Alice have?",
+    ],
+)
+def test_graph_confusers_refuse_without_compare_lift(text: str):
+    res = parse_and_solve(text, sealed=False)
+    assert res.answer is None
+    assert res.refusal_reason is not None
+
+
 def test_unknown_actor_refuses():
     emitted = inject_comparative_multiplicative(
         _make_match(_anchor(actor="fish")),