feat: Add repository protection systems

- Add PR template to prevent commercial content leakage
- Add automated workflow to scan for prohibited content
- Protect against business strategy, infrastructure details, customer info

.github/pull_request_template.md

@@ -0,0 +1,18 @@
+# 🚨 CRITICAL: Public Repository Checklist
+
+## Before merging this PR, confirm:
+
+- [ ] **No business strategy** - No pricing, revenue plans, or commercial roadmaps
+- [ ] **No customer info** - No specific customer details or enterprise discussions  
+- [ ] **No infrastructure details** - No Google Cloud project IDs or internal URLs
+- [ ] **No SkillVill content** - All SkillVill planning belongs in brain-cloud repo
+- [ ] **Open source focused** - Content appropriate for public consumption
+- [ ] **Registry references OK** - Only registry.soulcraft.com endpoint references allowed
+
+## ✅ This PR contains only:
+- [ ] Open source Brainy library improvements
+- [ ] Generic documentation updates
+- [ ] CLI enhancements (registry integration OK)
+- [ ] Community-focused features
+
+**🛡️ When in doubt, move content to brain-cloud private repo instead!**