feat: Phase 11 — CRUD (create/update/delete) + auth + web UI

- Core: createDocument/updateDocument/deleteDocument (file + DB + revision + chunks)
- Parser: stringifyFile (serialize markdown with frontmatter to disk)
- API: tRPC CRUD routers (auth-gated via requireWriteAuth middleware)
- API: createContext now passes expectedSecret from deps (request-scoped auth)
- MCP: 3 new write tools (create_document, update_document, delete_document)
- Web: /create page + ?edit=1 form, /api/auth/login (cookie-based), /api/docs REST CRUD
- Web: Edit buttons on homepage + doc pages (auth-gated)
- Tests: 8 new tests (5 tRPC CRUD + 3 MCP CRUD auth), 40 total all green

packages/core/src/index.service.ts

@@ -105,7 +105,7 @@ export function shouldCreateRevision(
  * (or no prior revision exists), create a new revision with an incremented
  * per-document revisionNo.
  */
-async function snapshotRevision(
+export async function snapshotRevision(
   slug: string,
   meta: ReturnType<typeof parseFile>["meta"],
   body: string,