Initial commit: RA-H Open Source Edition

Local-first knowledge management system with BYO API keys.

Features:
- 3-panel UI (Nodes | Focus | Helpers)
- SQLite + sqlite-vec for vector search
- Agent system (Easy/Hard mode orchestrators)
- Content extraction (YouTube, PDF, web)
- Integrate workflow for connection discovery
- Dimension system with auto-assignment

Tech stack:
- Next.js 15 + TypeScript + Tailwind CSS
- Anthropic (Claude) + OpenAI (GPT) via Vercel AI SDK

Setup:
  npm install && npm rebuild better-sqlite3
  scripts/dev/bootstrap-local.sh
  npm run dev

MIT License

.github/pull_request_template.md

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+# Pull Request
+
+## Description
+Brief description of what this PR does and why.
+
+## Type of Change
+Please delete options that are not relevant.
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Code refactoring (no functional changes)
+- [ ] Performance improvement
+- [ ] Test coverage improvement
+
+## Related Issues
+Closes #[issue number]
+Related to #[issue number]
+
+## Changes Made
+- [ ] Change 1: Description
+- [ ] Change 2: Description  
+- [ ] Change 3: Description
+
+## How Has This Been Tested?
+Please describe the tests that you ran to verify your changes:
+
+- [ ] Unit tests
+- [ ] Integration tests
+- [ ] Manual testing
+- [ ] API endpoint testing (if applicable)
+- [ ] Database operations verified
+- [ ] UI/UX testing (if applicable)
+
+### Test Configuration
+- Node.js version: [e.g., 18.17.0]
+- Operating System: [e.g., macOS 13.5]
+- Database: [e.g., PostgreSQL 15 with pgvector]
+
+## Screenshots/Videos
+If applicable, add screenshots or videos to demonstrate the changes.
+
+### Before
+[Screenshot/description of before state]
+
+### After  
+[Screenshot/description of after state]
+
+## Database Changes
+- [ ] No database changes
+- [ ] Schema changes (describe below)
+- [ ] Migration required
+- [ ] Seeds/fixtures updated
+
+If database changes are made, describe them:
+```sql
+-- Example of schema changes
+```
+
+## API Changes
+- [ ] No API changes
+- [ ] New endpoints added
+- [ ] Existing endpoints modified
+- [ ] Breaking changes to API
+
+If API changes are made, describe them:
+```typescript
+// Example of API changes
+```
+
+## Performance Impact
+- [ ] No performance impact expected
+- [ ] Performance improvement
+- [ ] Potential performance impact (explain below)
+
+## Security Considerations
+- [ ] No security implications
+- [ ] Security improvement
+- [ ] Potential security impact (explain below)
+
+## Documentation
+- [ ] Documentation updated
+- [ ] No documentation changes needed
+- [ ] Documentation to be updated in separate PR
+
+## Checklist
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings or errors
+- [ ] I have added tests that prove my fix is effective or that my feature works
+- [ ] New and existing unit tests pass locally with my changes
+- [ ] Any dependent changes have been merged and published
+
+## Deployment Notes
+Special instructions for deploying this change:
+- [ ] No special deployment requirements
+- [ ] Environment variables need to be updated
+- [ ] Database migration required
+- [ ] External service configuration needed
+
+## Breaking Changes
+If this introduces breaking changes, describe the migration path:
+
+## Additional Notes
+Any additional information that reviewers should know:
+
+---
+
+## For Reviewers
+### Review Focus Areas
+Please pay special attention to:
+- [ ] Code quality and style
+- [ ] Test coverage
+- [ ] Performance implications
+- [ ] Security considerations
+- [ ] Documentation accuracy
+
+### Testing Instructions
+Specific steps for reviewers to test this change:
+1. Step 1
+2. Step 2
+3. Step 3