[tarekziade]

Follow-up to #215, which only patched guidance routing. This fixes the parser itself.

The bug. Every trace in the CI dataset's model_results.json reads (line 130) AssertionError: … (all 376 integration failures on 2026-10-10). terminal_exception() only matched pytest E Exc: lines or a bare Exc: line, so it returned (None, "") for every trace. As a result:

• every group's terminal_exc was "other", so crash groups were never split by exception type and the AssertionError routing never fired;
• classify() fell back to symptom regexes, and 86 of 222 AssertionErrors came out other.

The fix. _BARE_EXC_PAT accepts the (line N) prefix. routing_exc() (#215) is now redundant and is removed: instruction_addendum and dispatch_category read terminal_exc again.

What it changes, measured on the 2026-10-11 window (370 persistent failures) with the real clustering, the real GitHub PR ledger and 30 days of attribution:

	before	after
groups	110	106
output_mismatch / other	48 / 50	70 / 22
cuda_runtime	1	3
fingerprints unchanged	–	42 (68 change)
open serge PRs matched to a group	27	27
rejections attached	19	19 (16 after the markers below)
groups deferred for ≥2 rejections	minimax_m3_vl, deepseek_v32, moshi, qwen3_vl_moe	same

Open PRs survive the re-key because of #214's test-overlap match. For closed PRs, FINGERPRINT_REKEY_DATE = "2026-10-12": a closed ITF PR opened before that date also matches by the tests it lists. Without that, plbart (#48605), blt (#48534) and big_bird (#48437, the <unk> hack, along with its maintainer feedback) would lose their history.

The 17 stale and duplicate serge PRs closed by hand on 2026-10-11 now carry <!-- serge-closed:stale|superseded --> in their bodies, so the bridge doesn't count them as rejections. The two moshi expectation rewrites stay as real rejections.

Merging is shipping (the nightly installs @main). Tests: test_ci_dataset_line_prefix, test_line_prefixed_assertion_is_an_output_mismatch, a pick_targets-built routing test, and test_pre_rekey_closed_pr_keeps_its_rejection_by_test. Full suite: 1142 passed. prompt_ab.py's ministral3-line-prefixed-assertion fixture now has the shape the triage builds.

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