### Other top-level commands
- `tix health` — project and issue health: read a scope, roll it up, or record a
change (metadata, never a status or a done marker)
- `tix layout` — inspect or migrate the configured on-disk issue layout (`[layout]`)
- `tix mentions` — the non-interactive `@mentions` surface: list what is pending and
apply the three answers without a prompt
- `tix migrate` — migrate local issue data to the canonical identity model
- `tix milestone` — manage milestones
- `tix rollover` — roll open issues forward from an expired cycle to its successor
- `tix mcp` — serve the MCP protocol (JSON-RPC 2.0 over stdio) for agent tools