docs(phase3): complete WP6.4 - WORKFLOWS.md comprehensive reference

- Add complete documentation for all 8 GitHub Actions workflows
- Bootstrap, reusable-pr-checks, pr-into-dev, dev-to-main
- claude-plan-to-issues, create-branch-on-issue, pr-status-sync, release-status-sync
- Each workflow includes: purpose, triggers, permissions, configuration, examples
- Add comprehensive troubleshooting sections for each workflow
- Add workflow relationships, dependency graph, and interaction matrix
- Add best practices for each development phase
- Add common customizations (task limits, branch naming, notifications)
- Add general debugging section with common error patterns
- 2,555 lines, 64KB comprehensive reference
- Follows same structure as QUICK_START, COMPLETE_SETUP, TROUBLESHOOTING

Phase 3 Progress: 33% complete (5/15 deliverables)
- ✅ README.md, QUICK_START.md, COMPLETE_SETUP.md, TROUBLESHOOTING.md, WORKFLOWS.md
- ⏳ COMMANDS.md (next), CUSTOMIZATION.md, ARCHITECTURE.md
- ⏳ Setup automation (3 scripts)
- ⏳ Testing & examples (4 deliverables)

🤖 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: alirezarezvani