feat(workflow): Add workflow plugin v1.0.0

Git workflow, code quality, context management and testing commands:
- commit, push, pr, issue - git operations
- simplify, refactor, verify, check - code quality
- catchup, onboard, save, cleanup - context management
- test, format, sync - development utilities

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/workflow/templates/pr-template.md

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+# Pull Request Template
+
+## Title Format
+
+```
+<type>: <description>
+```
+
+Examples:
+- `feat: Add user authentication flow`
+- `fix: Resolve data sync race condition`
+- `refactor: Simplify error handling in API client`
+
+---
+
+## Body Template
+
+```markdown
+## Summary
+
+Brief description of what this PR does and why.
+
+- Key change 1
+- Key change 2
+- Key change 3
+
+## Changes
+
+### Added
+- New feature or file
+
+### Changed
+- Modified behavior or file
+
+### Removed
+- Deleted feature or file
+
+### Fixed
+- Bug that was fixed
+
+## Screenshots
+
+If applicable, add screenshots or recordings.
+
+## Test Plan
+
+- [ ] Unit tests added/updated
+- [ ] Manual testing completed
+- [ ] Edge cases verified
+
+### How to Test
+
+1. Step 1
+2. Step 2
+3. Step 3
+
+## Checklist
+
+- [ ] Code follows project style guidelines
+- [ ] Self-review completed
+- [ ] Comments added for complex logic
+- [ ] Documentation updated (if needed)
+- [ ] No new warnings introduced
+- [ ] Tests pass locally
+
+## Related Issues
+
+- Closes #123
+- Refs #456
+
+---
+
+Generated with [Claude Code](https://claude.ai/claude-code)
+```
+
+---
+
+## Minimal Template
+
+For small changes:
+
+```markdown
+## Summary
+
+- [One line description]
+
+## Test Plan
+
+- [ ] [How you verified this works]
+
+---
+
+Generated with [Claude Code](https://claude.ai/claude-code)
+```
+
+---
+
+## Draft PR Template
+
+For work in progress:
+
+```markdown
+## WIP: [Feature Name]
+
+### Done
+- [x] Task 1
+- [x] Task 2
+
+### In Progress
+- [ ] Task 3
+
+### Blocked
+- [ ] Task 4 (waiting on X)
+
+### Questions
+- Question 1?
+- Question 2?
+
+---
+
+Generated with [Claude Code](https://claude.ai/claude-code)
+```