docs(work): scaffold conformance-hardening-v1 epic + stories

docs/work/conformance-hardening-v1/01-ast-manifest-source/_story.md

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+---
+id: 01-ast-manifest-source
+epic: conformance-hardening-v1
+title: Replace regex manifest source parser with AST
+type: technical-story
+status: in-progress
+feature: core-eslint
+depends-on: []
+blocks: [02-dev-seed-assertion]
+---
+
+## Goal
+`readManifestSource` in `_manifest-source.js` returns the same shape but
+uses `@typescript-eslint/parser` AST traversal instead of regex.
+
+## In scope
+- Rewrite `readManifestSource` to delegate to a new `parseManifestFully`
+  in `_manifest-ast.js` that returns `{ name, requiredCores, useCases }`
+- Existing 4 tests for `readManifestSource` must still pass
+- Add tests covering the previously-fragile cases: `name:` in JSDoc,
+  single-quoted strings, manifest declared with `let` instead of `const`
+
+## Out of scope
+- Changing the `_manifest-source.js` exports surface (filesystem helpers
+  `manifestPathForFeature` and `featureRootForFile` stay untouched)
+- Changing any rule's behaviour beyond the parsing path
+
+## Tasks
+- [ ] Epic + story scaffold
+- [ ] Extend `_manifest-ast.js` with `parseManifestFully`
+- [ ] Switch `readManifestSource` to delegate to `parseManifestFully`
+- [ ] Add edge-case tests
+- [ ] Verify all rules still pass; commit