Initial Coworker app scaffold

CONTRIBUTING.md

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+# Contributing
+
+Coworker is built through Gitea Actions. Keep local work lightweight and use the Ubuntu runners for dependency setup, tests, builds, packaging, and release checks.
+
+## Workflow
+
+1. Check `git status --short --branch`.
+2. Keep changes focused.
+3. Update docs when behavior or release artifacts change.
+4. Push and watch Gitea workflows.
+5. Fix failed runner checks before considering work complete.
+
+## Commands
+
+Run on Gitea runners:
+
+```bash
+npm install
+npm run lint
+npm run test
+npm run build
+npm run package:win
+npm run audit
+```
+
+Local:
+
+```bash
+git diff --check
+```