#530's remote/repo guard blocked mcp_get_control_plane_guide(remote=prgs)
because the bare default resolves to Timesheet while local git is
Gitea-Tools, and remediation told callers to pass org/repo on a tool that
did not accept those parameters.
- Accept optional org/repo on mcp_get_control_plane_guide
- Prefer local git remote org/repo when bare defaults mismatch (read-only guide)
- Keep mutation tools fail-closed on bare mismatch
- Align remediation text with tools that accept org/repo
Closes#588
