- Add `qa` agent entry to `.story_kit/project.toml` with a detailed
prompt covering code quality scan, test verification, manual testing
support, and structured report generation
- Add `move_story_to_qa` function in `agents.rs` that moves a work item
from `work/2_current/` to `work/3_qa/` and auto-commits (idempotent)
- Add `request_qa` MCP tool in `mcp.rs` that moves the story to
`work/3_qa/` and starts the QA agent on the existing worktree
- Add unit tests for `move_story_to_qa` (moves, idempotent, error cases)
- Update `tools_list_returns_all_tools` test to expect 27 tools
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>