SD-224
[zombie-code-audit] Four-crew parallel zombie code audit. Architect, Artisan, Watchdog, Sentinel dispatched as subagents to 4 git worktrees. Reports filed at docs/internal/reviews/ (all 444). Findings: Architect ~1,455 LOC removable (3 false positives self-caught). Artisan ~476 LOC (frontend clean). Watchdog 3 tautological tests + bout-engine.ts zero coverage. Sentinel 0 critical, 3 HIGH (all quick fixes), audit 20→10 vulns. Four PRs opened: #381 rename, #382 dead modules, #383 test tautologies, #384 security fixes. Bugbot reviewed: found 1 missed rename (line-break split) and 1 still-tautological assertion (inside guard). Both fixed and pushed for re-review. All 4 PRs merged sequentially with gate verification between each. Review artifacts committed as cross-model archaeology (SD-227).
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