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/CHANGELOG.md

@@ -100,7 +100,7 @@ Major reorganization consolidating agents, commands, and skills from multiple so
 - `/prime` - Prime/setup command
 - `/create-agent-skill` - Create or edit Claude Code skills
 - `/heal-skill` - Fix skill documentation issues
-- `/workflows:codify` - Document solved problems for knowledge base
+- `/codify` - Document solved problems for knowledge base
 
 **New Skills (10)**
 - `andrew-kane-gem-writer` - Write Ruby gems following Andrew Kane's patterns
@@ -125,7 +125,7 @@ Major reorganization consolidating agents, commands, and skills from multiple so
 
 **Commands Restructured**
 - Workflow commands moved to `commands/workflows/` subdirectory
-- `/plan`, `/review`, `/work` now accessed as `/workflows:plan`, `/workflows:review`, `/workflows:work`
+- `/plan`, `/review`, `/work`, `/codify` accessible via short names (autocomplete) or full path
 
 ### Summary