Summary

• add crash-safe shareable incident capture with segmented rolling state and incident recovery
• harden restart and crash recovery around torn segments, stale manifests, missing incident files, and incomplete preludes
• add focused regressions for live, restart, manifestless, and crash-path recovery edge cases

Verification

• npm test -- test/shareable-debug.test.ts test/openai-loader-fetch.shareable-debug.test.ts test/acquire-auth-shareable-debug.test.ts
• npm run typecheck
• npm run typecheck:test
• npm run verify