* feat(adr-0182): anchor-skip + intra-clause accumulation — distractor 0016 refuses, twin 0017 solves (confuser wrong 1->0)
The last confuser wrong. 0016 ("A train travels 60 miles per hour for 2 hours. Tom
has 8 tickets and buys 4 more tickets. How many tickets?") committed the blunt
product 60x2x8x4=3840 because it was the unique complete reading: the train sentence
is an all-foreign anchor-position block (2 quantities, can't seed an anchor) and the
Tom sentence packs state+change in ONE sentence ("has 8 ... and buys 4 more"), which
the sentence-level reader couldn't decompose -> accumulation_candidates was empty ->
no rival reading -> product committed.
The microscope confirmed intra-clause state+change is a REAL GSM8K pattern (train-0010
"Yun had 20 paperclips initially, but then lost 12"; practice-0121 "Sam has 30 apples
and gives 10 to Anna") -- so this is genuine comprehension, not a 0016-only patch.
Mechanism (added to accumulation_candidates ONLY -> feeds only the pool; train_sample
serving + practice use compose_accumulation, unchanged -> 3/47/0 byte-identical by
construction):
- _sub_clauses: sentence clauses further split on coordinating conjunctions
(and / then / and then). LOCAL to the ungated candidate generator -- the global
segmenter (GB-1/GB-2/serving) is untouched.
- _build_accumulation_anchor_skip: anchor = first single-quantity sub-clause (leading
non-anchorable all-foreign blocks are skipped); chain the conjunction-mate change
("buys 4 more" -> +4). Referent guard + polarity-cue requirement still gate it
(a no-cue sub-clause -> refuse), so GB-2 same-unit lists ("6 apples and 4 apples")
produce no spurious candidate.
Result (sealed lane):
- confuser wrong 1 -> 0. distractor-quantity 0 wrong / 2 refused: 0016 refuses
(product 3840 [complete] vs additive 12 [exempt] disagree). BONUS: the clean twin
0017 ("Tom has 8 tickets and buys 4 more tickets", no distractor) now *solves* 12
-- genuine comprehension of a real positive, the comprehension-vs-surface-match
discrimination the corpus exists to measure. genuine positives 7 -> 8 solved.
- the only non-clean verdict left is 1 spurious (0010 multi-referent "altogether" --
a separate H1 graduation question, not this lever).
- train_sample 3/47/0 and practice 3/47/0 byte-identical; 243 derivation/pool tests
+ 40 architectural invariants green.
Tests:
- test_adr_0182_pool.py TestAnchorSkipIntraClause: intra-clause twin resolves to 12;
the 0016 anchor-skip candidate classifies `exempt`; 0016 refuses via disagreement;
no spurious extra candidate without a conjunction.
- test_adr_0163_f2_confusers.py: baseline wrong 1->0, positives_solved 7->8; renamed
test_distractor_quantity_refuses asserts BOTH 0014 and 0016; new
test_intra_clause_twin_0017_solves.
Stacked on #480 (prior-state guard); merge #480 first. Confuser arc wrong 7->5->2->1->0.
* test(adr-0182): close anchor-skip refuse-branch coverage gap (lookback finding)
The four-PR lookback review (EX-6/pooling/prior-state/anchor-skip) found the
anchor-skip refuse branches in _build_accumulation_anchor_skip untested: the
referent guard (new named actor -> refuse) and the polarity-cue requirement were
asserted but not proven (no test would fail if removed). Per the schema-obligation
discipline, add NON-VACUOUS failing-under-violation tests:
- test_anchor_skip_referent_guard_discriminates_actor: identical structure, change
sub-clause subject is a pronoun ('he', same referent -> 12 IS produced) vs a new
name ('Sara' -> guard suppresses it). Removing _same_referent makes the new-actor
case also produce 12 -> the second assertion fails. (Non-vacuous: the positive
control proves the path is reachable, so the negative isn't trivially-empty.)
- test_anchor_skip_requires_a_polarity_cue: 'gets 4 more' (cue -> 12) vs 'owns 4'
(no cue -> not guessed). Removing the polarity gate makes the no-cue case produce
a reading -> fails.
- test_anchor_skip_refuses_without_single_quantity_anchor: no single-quantity
sub-clause -> () (does not force a multi-quantity clause to anchor).
No code change; behavior unchanged. Confuser wrong stays 0; 281 derivation tests +
40 invariants green.
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