Until now the markdown importer was one-way (plans/*.md → DB). Any
agent-driven status flip via claim_task / complete_task would be
clobbered on the next importer sweep. This change closes the loop: the
DB now projects status, priority, agent_prompt, and updated_at back
into the file's frontmatter, preserving body bytes, key order, and
every other frontmatter key.
New: packages/database/src/markdown-backlog/export.ts
- `rewriteFrontmatter()` — pure function, covered by 10 Vitest cases
(round-trip identity, status flip, priority flip, agent_prompt
null/block-scalar/single-line variants, body preservation,
trailing-newline preservation, idempotent re-application).
- `exportBacklogItemToMarkdown()` — DB-loading wrapper with atomic
write (tmp + rename) and tenant fencing. Returns a structured
result so callers can surface what happened in their response.
Wired into:
- `claim_task` MCP tool — exports on the ready → in_progress flip.
- `complete_task` MCP tool — exports on any finalStatus transition.
- `backlog.updateWorkflowPrompt` tRPC mutation — exports on prompt
edits made through the app UI.
Robust repo-root resolution (`apps/{mcp-server,web}/src/lib/repo-root.ts`,
plus a copy in `import-markdown-backlog.ts`): walk up from the source
file looking for `pnpm-workspace.yaml`, falling back to env var or cwd.
This fixes a class of bug where `pnpm --filter <pkg>` cd's into the
package directory and breaks naive cwd-based path resolution — the
importer was deleting all 44 rows during smoke testing before this fix
because it found zero files in `packages/database/plans/`.
`config/CursorSync.md`: documents the new two-way contract, the
DB-wins-on-allow-list conflict policy, and the
MARKDOWN_BACKLOG_REPO_ROOT=off escape hatch for production deployments
where `plans/` isn't checked out.
Smoke verified end-to-end against the homelab DB: claim flips file
status to in_progress, complete flips it back to ready, importer
round-trips with stable content_hash (true no-op), agent identity
preserved throughout.
Co-authored-by: Cursor <cursoragent@cursor.com>
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