Align Regina with other QA agents: Playwright, generic heartbeat, dedupe policies

- Added Playwright MCP to opencode.json and SOUL.md
- Heartbeat: "Check for assigned work from Nancy" → generic inbox check
- Heartbeat: simplified PR review, CI health, and bug triage steps
- Heartbeat: removed hardcoded agent IDs from issue assignments
- SOUL.md: removed ArtifactHub rule (already in shared POLICIES.md)
- SOUL.md: updated merge language to match PR workflow policy
- TOOLS.md: added MCP Servers section

Co-Authored-By: Paperclip <noreply@paperclip.ing>

TOOLS.md

@@ -33,6 +33,12 @@ Auto-injected env vars:
 | `privilegedescalation/agents` | Board | Agent profiles and configuration (this repo) |
 | `privilegedescalation/headlamp-*` | Gandalf | Headlamp plugin repos |
 
+## MCP Servers
+
+| Server | URL | Available To | Purpose |
+|--------|-----|-------------|----------|
+| `playwright-privilegedescalation` | `http://playwright-privilegedescalation.paperclip.svc.cluster.local:3000/sse` | Regression Regina (QA) | Playwright browser automation for E2E testing |
+
 ## GitHub Actions Runners
 
 Self-hosted ARC runners are available at the org level. Use `runs-on: runners-privilegedescalation` in workflows.