## Description
`headroom mcp status` only inspected `~/.claude/mcp.json`, but servers
registered via `claude mcp add` (user scope) live in `~/.claude.json`.
So `status` printed `✗ No config file` even when headroom was registered
and `claude mcp list` reported it Connected. This detects the
registration across every location Claude Code uses.
## Type of Change
- [x] Bug fix (non-breaking change that fixes an issue)
## Changes Made
- Add `find_headroom_registration()` that checks `~/.claude.json`,
`~/.claude/mcp.json`, then `./.mcp.json` (first match wins).
- Use it in `mcp status` for both the "Configured" check and the
proxy-URL lookup.
## Testing
- [x] Unit tests pass (`pytest`)
- [x] New tests added for new functionality
- [x] Manual testing performed
### Test Output
```text
$ pytest tests/test_cli/test_mcp_status.py -q
5 passed in 0.13s
```
## Real Behavior Proof
- Environment: Linux, Python 3.13, editable build of this branch
- Exact command / steps: registered headroom in ~/.claude.json, then ran
`headroom mcp status`
- Observed result: prints `✓ Configured` with the ~/.claude.json path
(previously `✗ No config file`)
- Not tested: project-scoped ./.mcp.json discovery in a real multi-repo
workflow
## Review Readiness
- [x] I have performed a self-review
- [x] This PR is ready for human review
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: JerrettDavis <mxjerrett@gmail.com>
