docs(M291): V1_004 sub-bench B empirical pattern shift + aprender#1853 fix#259
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…error → oracle_failed_after_max_turns The M287 greedy baseline (uniform driver_error from "Human:" infinite loop) is broken: sub-bench B with 3-knob sampling (temp=0.3, top_k=50, top_p=0.95, rep_penalty=1.2, repeat_last_n=64) + #1849 few-shot prompt + #1852 EOS stop_token yields `oracle_failed_after_max_turns turns=20` on fixture 1. Diagnosis of three independent gaps: - Gap 1 (clean_chat_output start-of-string leak): FIXED via aprender#1853 - Gap 2 (few-shot prompt insufficient to override Markdown distribution) - Gap 3 (arena doesn't recover from skipped turns) V1_004 status: partially discharged (pattern shift confirmed), not fully discharged (no oracle_passed yet). Bench continues fixtures 2-20. No M-counter bump on surfaces — Phase 6 in active bench-run state; surface bumps wait for V1_004 discharge or pattern conclusion. Refs: - aprender#1853 (Gap 1 fix; clean_chat_output strip) - aprender#1852 (EOS stop_token in MoE) - aprender#1849 (few-shot prompt) - evidence/under-contract-30b-greedy-2026-05-21/ (M287 baseline archive) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
evidence/phase-6/v1004-sub-bench-b-pattern-shift-2026-05-21.md(~105 LOC) characterizing the M287 → M291 categorical pattern shift on Qwen3-Coder-30B Phase 6 sub-bench B.outcome=driver_error(infinite "Human:" loop, hit timeout); sub-bench B with 3-knob sampling + #1849 few-shot prompt + #1852 EOS stop_token showsoutcome=oracle_failed_after_max_turns turns=20on fixture 1.Cross-references
<tool_call>examples in CODE_SYSTEM_PROMPTevidence/phase-6/v1004-followup-snapshot-2026-05-20.md— M290 5-PR snapshotevidence/under-contract-30b-greedy-2026-05-21/— M287 greedy baseline archiveTest plan
bash scripts/check-doc-drift.sh— 17/17 drift classesbash scripts/test-doc-drift.sh— detector live-test passes🤖 Generated with Claude Code