feat(ralph): add autonomous project execution system

- router.py: add !approve, !status, !stop, !propose commands for project lifecycle management
- approved-tasks.json: coordination schema for evening→night→morning pipeline
- tools/ralph/: ralph.sh loop, prompt.md, prd-template.json
- cron/jobs.json: enable morning-report, evening-report, night-execute (23:00 opus)

Evening-report proposes features to approved-tasks.json as 'pending'; Marius
approves via !approve; night-execute launches ralph.sh per project.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

approved-tasks.json

@@ -0,0 +1,4 @@
+{
+  "projects": [],
+  "last_updated": null
+}