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Adds supervisor/deploy_health_check.py: run_health_check() runs the three pre-cutover checks in order, stopping at the first failure (03-C: "任一检查项 fail 立即整体判定 health_check_failed，不等待其余检查项跑完") and persisting a deploy_health_signal row for every check that actually ran. - process_alive: polls deploy_supervisor.is_alive() up to HEALTH_CHECK_STARTUP_TIMEOUT. - http_health: hits the candidate's /api/health -- added to backend_server.py (U-037 deliberately left this for U-038). Not just "process exists" -- runs a real SELECT 1 to catch a wedged sqlite connection a live-but-stuck process would otherwise pass. - canary_task: a real (not mocked) project+task creation round-trip against the candidate over HTTP -- no real Org Graph/claude calls, since c_task_create's synchronous 'queued' landing is already a deterministic, always-should-pass result, which is what a canary needs. Timeouts are the MVP-fixed drafts from 05 §5.9, explicitly flagged there as needing real calibration later, not hardcoded as authoritative. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
