- Controllers/SelfTestController.wsc: runs the same checks as
  tests/Test-Components.vbs in-process, returns JSON
  ({ok, checks:[{name,pass,detail}]}) - no PowerShell/cscript/SSH needed
- Application.wsc routes /self-test to it; always HTTP 200 (pass/fail lives
  in the JSON body, matching conventional health-check design)
- tests/run-self-test.sh: pure curl + python3 wrapper, verified working
  directly from the Linux host with zero Windows tooling
- tests/Test-Http.ps1: now also calls /self-test and folds each check into
  its own PASS/FAIL output
- Verified both the happy path and a genuine failure path (deliberately
  broke HomeController's registration, confirmed /self-test correctly
  reported ok:false with the specific failing check pinpointed, then
  re-registered and confirmed full recovery)
- docs updated: ARCHITECTURE.md, DECISIONS.md, TEST-RESULTS.md