SD-277

[broadside-phases-1-3] Testing broadside Phases 1-3 complete. PR #408. Estimated 105 agent-minutes, actual 25 (4.2x faster). Phase 1: 44 clearAllMocks→resetAllMocks (92 breakages fixed — all mock leaks), 7 Object.defineProperty try/finally guards. Phase 2: 154 bout-engine tests audited, 14 status-code-only assertions strengthened. Critical finding: 4 paths return 402 (Right Answer Wrong Work quadruple ambiguity). Phase 3: 246 API status-code assertions audited (88% already strong, 30 strengthened). 44 bare toHaveBeenCalled audited (34 strengthened with argument matchers). Total: 78 assertions hardened across 51 files. Zero Captain decisions required (full autonomy). Gate: 1279 passed, 0 failed, 96.06% coverage.

Active — PR #408

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