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name: "MCP update_story tool should support front matter fields"
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# Story 267: MCP update_story tool should support front matter fields

## User Story

As an operator using the MCP tools, I want update_story to accept optional front matter fields (like agent, manual_qa, etc.) so that I can update story metadata without editing files by hand.

## Acceptance Criteria

- [ ] update_story MCP tool accepts optional agent parameter to set/change the agent front matter field
- [ ] update_story MCP tool accepts optional arbitrary front matter key-value pairs
- [ ] Front matter updates are auto-committed via the filesystem watcher like other story mutations

## Out of Scope

- TBD
