{
  "date": "2026-10-25",
  "branch": "codex/engine-foundations",
  "approximateFullPlanCompletePercent": 56,
  "scope": [
    "Main-thread liveness probes independent of rendering and frame acknowledgements",
    "Five-second outstanding-probe deadline with hidden-tab suspension and observer-resume grace",
    "Terminal failures terminate simulation and fence queued deliveries",
    "Manual retry preserves lightweight local progress and rejoins the shared session"
  ],
  "verification": {
    "headless": {
      "passed": 547,
      "failed": 0,
      "evidence": "simulation-watchdog-full.tap"
    },
    "focusedHeadless": {
      "passed": 12,
      "includes": "6 watchdog cases and 6 renderer-recovery cases, included in the full suite"
    },
    "watchdogBrowser": {
      "passed": 3,
      "failed": 0,
      "evidence": "simulation-watchdog-browser-tests.json"
    },
    "graphicsBrowser": {
      "passed": 3,
      "failed": 0,
      "evidence": "simulation-watchdog-graphics-tests.json"
    },
    "staticChecks": "TypeScript and import boundaries passed (108 package source files)",
    "build": "Browser harness built isolated production client and engine bundles",
    "visual": "simulation-watchdog-stopped.png reviewed at 960 \u00d7 640"
  },
  "testDevelopmentNotes": [
    "The initial injected infinite loop used DevTools Runtime.evaluate; the error UI appeared and terminate was called, but the inspector worker target remained attached. Injecting a normal worker message task instead verified actual worker termination. No production deadline was relaxed.",
    "The stronger seeded-progress assertion initially compared a pre-acknowledgement pause save against the accepted paused position (2 cm of gravity settling). It now waits for the simulation pause acknowledgement; final assertions require exact position, inventory, flags and doors."
  ],
  "limits": [
    "Restoration uses existing lightweight saves and a manual reload; exact native checkpoint restart remains open.",
    "Monitoring starts after simulation initialization and cannot interrupt a blocked main thread.",
    "Asynchronous job deadlines, behavior budgets, interrupted shared-edit recovery and third-party isolation remain open.",
    "Software-rendered Chromium acceptance is not physical-device or multi-machine certification.",
    "No complete roadmap milestone is closed."
  ]
}