fix: server-side API probe, component tests, CI lint gate, docs parity

Author: AhmadGolbooee

CONTRIBUTING.md

@@ -1,5 +1,23 @@
-Contributing to OwlGuild DevFlow.
-- Small PRs
-- English commit messages (imperative)
-- One concern per commit
-- Add tests when changing behavior
+# Contributing
+
+Part of [OwlGuild](https://github.com/OwlGuild).
+
+## Ground rules
+
+- Small pull requests; one concern per commit.
+- English commit messages in the imperative mood ("Add live status probe").
+- Every component gets a test that would fail if the component broke.
+- CI must be green before review.
+
+## Local checks
+
+```bash
+npm ci
+npm test
+npm run lint
+npm run build
+```
+
+## Review
+
+Both maintainers review before merge. Keep discussion in the PR, keep scope in the diff.