docs(doctor): api-reference and changeset

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

.changeset/doctor-in-settings.md

@@ -0,0 +1,5 @@
+---
+"aicodeman": minor
+---
+
+Settings → System → Diagnostics runs `codeman doctor` on the server (`GET /api/doctor`) and lists which agent CLIs, tmux, Node and the optional office tools are installed, their versions, paths and install hints. The probe runs in a child process so a slow `--version` can never freeze the server; admin only in multi-user mode.

docs/api-reference.md

@@ -748,6 +748,10 @@ Posts the Web Push events to ntfy, Slack, Discord or a generic JSON URL (Setting
 
 Delivery goes through the same egress guard as web tabs (refused on the resolved address too), does not follow redirects, times out after 5 s, sends the same event for the same session at most once per 3 s, and has at most 5 requests in flight. Error text never contains the URL.
 
+## Diagnostics
+
+`GET /api/doctor[?category=core|office|other]` returns the `codeman doctor --json` report (`platform`, `summary`, `tools[]` with `status` `ok` \| `missing` \| `outdated` \| `skipped` \| `error`, `version`, `path`, `installHint`). The probe engine is synchronous, so it runs in a child process of the same entry script, never on the server's event loop (30 s timeout). It names install paths and versions, so it is admin only in multi-user mode (`403`). `400` for an unknown category, `500` if the child produces no report.
+
 ## Voice dictation
 
 Browser dictation transcribed through this server's Claude Code login, i.e. the