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/handoff-template.md

@@ -0,0 +1,130 @@
+# Handoff Template
+
+Use this template when saving progress with `/workflow:save`.
+
+---
+
+```markdown
+# Handoff Document
+
+**Branch:** [branch-name]
+**Last Updated:** [YYYY-MM-DD HH:MM]
+**Goal:** [What we're trying to accomplish]
+
+---
+
+## Progress
+
+### Completed
+- [x] Task 1: Brief description
+- [x] Task 2: Brief description
+
+### In Progress
+- [ ] Task 3: Brief description
+  - Started: [what's done]
+  - Remaining: [what's left]
+
+### Not Started
+- [ ] Task 4: Brief description
+- [ ] Task 5: Brief description
+
+---
+
+## Key Decisions
+
+### Decision 1: [Title]
+**Context:** Why this decision was needed
+**Choice:** What was decided
+**Rationale:** Why this option was chosen
+
+### Decision 2: [Title]
+**Context:** ...
+**Choice:** ...
+**Rationale:** ...
+
+---
+
+## Files Modified
+
+| File | Changes |
+|------|---------|
+| `path/to/file1.ts` | Added feature X |
+| `path/to/file2.ts` | Fixed bug Y |
+| `path/to/file3.ts` | Refactored Z |
+
+---
+
+## Current State
+
+### Working
+- Feature A is functional
+- Tests pass
+
+### Not Working
+- Feature B has a bug in edge case
+- Test for C is flaky
+
+### Uncommitted Changes
+```
+M src/utils.ts
+M src/api/client.ts
+?? src/new-file.ts
+```
+
+---
+
+## Blockers
+
+- [ ] Blocker 1: Description and what's needed to unblock
+- [ ] Blocker 2: Description
+
+---
+
+## Next Steps
+
+1. **Immediate**: First thing to do when resuming
+2. **Then**: Second priority
+3. **Later**: Can be done after main task
+
+---
+
+## Notes
+
+### Important Context
+- Note 1: Something important to remember
+- Note 2: A gotcha or edge case
+
+### Links
+- Issue: #123
+- PR: #456
+- Docs: https://...
+
+### Questions for User
+- Question 1?
+- Question 2?
+```
+
+---
+
+## Minimal Handoff
+
+For quick saves:
+
+```markdown
+# Handoff
+
+**Branch:** feature/xyz
+**Goal:** Implement user preferences
+
+## Done
+- [x] Database schema
+- [x] API endpoint
+
+## Next
+1. Add frontend form
+2. Write tests
+
+## Notes
+- Using Zustand for state (user preference)
+- Validation schema in src/lib/validators.ts
+```