docs: fix workflow command documentation to use correct syntax

Update all documentation to show the correct command syntax:
- `/plan`, `/review`, `/work`, `/codify` (short form, autocompletes)

Previously showed `/workflows:plan` etc. which doesn't work.
The `name:` field in frontmatter determines the short command name.

Fixes #19

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

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

plugins/compounding-engineering/CLAUDE.md

@@ -35,7 +35,7 @@ agents/
 └── docs/       # Documentation agents
 
 commands/
-├── workflows/  # Core workflow commands (/workflows:*)
+├── workflows/  # Core workflow commands (/plan, /review, /work, /codify)
 └── *.md        # Utility commands
 
 skills/