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>

tools/ralph/prd-template.json

@@ -0,0 +1,19 @@
+{
+  "projectName": "feature-name",
+  "branchName": "ralph/feature-name",
+  "description": "Descriere scurtă a feature-ului",
+  "userStories": [
+    {
+      "id": "US-001",
+      "title": "Titlu story",
+      "description": "As a [user type], I want [feature] so that [benefit]",
+      "priority": 1,
+      "acceptanceCriteria": [
+        "Criteriu specific și verificabil",
+        "npm run typecheck passes"
+      ],
+      "passes": false,
+      "notes": ""
+    }
+  ]
+}