Awing Tree Status Route Patch

Adds /tree/{treename}/status[/{job}] handled inside TreeServiceController.

Routes
- Invoke:  GET /tree/{treename}/{jsonStem}
           loads <DriveRoot>\tree\{jsonStem}.json
           runs Dist(command,infu,inv)
           returns zson JSON {invoking,result,...}

- Status:  GET /tree/{treename}/status
           returns busy + activeJobs + lastCompleted/lastError

- Job:     GET /tree/{treename}/status/{jobStem}
           checks for tree\{jobStem}.zson or .eson and reports done/busy

Notes
- Status is informational only; tree semantics remain JSON-command based.
- TreeJobTracker is an in-memory helper for "busy" reporting.
- Completion can be detected either by watching for the .zson/.eson file or by polling status.

Generated: 2026-02-18T15:29:27.897514Z