[STABLE] Add development framework documentation

DEVELOPMENT.md

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+# WP Allstars Plugin Development Workflow
+
+This document outlines the development workflow for the WP Allstars Plugin to ensure stable and reliable feature implementation.
+
+## Development Principles
+
+1. **Stability First**: The primary goal is maintaining a stable plugin that works reliably
+2. **Incremental Changes**: Implement changes in small, manageable increments
+3. **Complete Testing**: Every change must be thoroughly tested before integration
+4. **Documentation**: All features and changes must be well-documented
+
+## Branch Structure
+
+- `main` - Production-ready code, always stable
+- `v0.2.3-stable` - Our current stable development branch
+- `feature/v0.2.3-stable/{feature-name}` - Feature branches for new development
+
+## Development Workflow
+
+### 1. Feature Planning
+
+1. Identify a feature from the ROADMAP.md file to implement
+2. Review any existing implementation in unstable versions
+3. Document the implementation plan in ROADMAP.md
+4. Create a new feature branch from the stable base
+
+```bash
+git checkout v0.2.3-stable
+git checkout -b feature/v0.2.3-stable/sync-guard
+```
+
+### 2. Feature Implementation
+
+1. Start with the smallest possible functional change
+2. Commit frequently with descriptive commit messages including stability classification
+3. Example commit message format:
+   ```
+   [EXPERIMENTAL] Add basic sync guard detection functionality
+   
+   - Adds file existence check for .syncing flag
+   - Implements conditional loading based on flag
+   - Does not yet handle admin notices
+   ```
+
+4. Reference the ROADMAP.md and TESTING.md documents while implementing
+
+### 3. Testing
+
+1. Complete all relevant tests from TESTING.md
+2. Add feature-specific tests if needed
+3. Test in a clean WordPress environment
+4. Test with WP_DEBUG enabled
+5. Document any issues found and fix them
+
+### 4. Code Review
+
+1. Self-review code for:
+   - PHP best practices
+   - WordPress coding standards
+   - Security considerations
+   - Performance implications
+   - Error handling
+
+2. Consider peer review if possible
+
+### 5. Integration
+
+1. Create a pull request to merge into the stable branch
+2. Summarize changes, testing performed, and any caveats
+3. Once approved, merge using `--no-ff` to preserve feature history
+
+```bash
+git checkout v0.2.3-stable
+git merge --no-ff feature/v0.2.3-stable/sync-guard
+```
+
+4. Tag new version if appropriate:
+
+```bash
+git tag v0.2.3.1-stable
+git push origin v0.2.3.1-stable
+```
+
+5. Update STABILITY.md with the new version information
+
+### 6. Post-Integration
+
+1. Deploy to test environment and confirm functionality
+2. Update ROADMAP.md to reflect the implemented feature
+3. Clean up feature branch if no longer needed
+
+## Handling Unstable Code References
+
+When examining code from unstable versions:
+
+1. **Never copy-paste directly** - Understand the approach and reimplement
+2. **Isolate problematic code** - Identify why it might have failed
+3. **Take the best ideas** - Implement the concept, not the exact implementation
+4. **Document the reference** - Note which version inspired each implementation
+
+## Versioning Scheme
+
+- `vX.Y.Z` - Major.Minor.Patch
+- `vX.Y.Z-stable` - Stable development branches
+- `vX.Y.Z.N-stable` - Minor updates to stable branches
+
+## Continuous Improvement
+
+- Regularly review and update these development procedures
+- Document lessons learned
+- Improve testing procedures based on discoveries