[gandazgul]

Summary

• Convert the Plan store, its test suite, and the Epic-save audit probe to TypeScript. The batch covers about 7,800 lines of Plan persistence, identity, archival, and tests.
• Preserve public Plan types and legacy or user-authored YAML metadata. Update module references, the Bun test inventory, and the JavaScript baseline.
• Keep the audit probe outside normal test discovery and preserve the historical evidence manifest.

Validation

• Three focused Plan suites passed with Bun 1.4.3. The Epic-save probe type-checked and passed in an isolated test wrapper.
• Compared Bun output for 322 affected source and test files. The output matched after normalizing module extensions, the equivalent status membership helper and event guard, and the test-only assertion that narrows the loaded Plan.
• All 102 existing Plan store test cases were retained.
• Independent spec, standards, and test review passed after addressing the findings.