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/commands/generate_command.md

@@ -127,7 +127,7 @@ Implement #$ARGUMENTS following these steps:
 
 ## Creating the Command File
 
-1. **Create the file** at `.claude/commands/[name].md` or `.claude/commands/workflows/[name].md`
+1. **Create the file** at `.claude/commands/[name].md` (subdirectories like `workflows/` supported)
 2. **Start with YAML frontmatter** (see section above)
 3. **Structure the command** using the template above
 4. **Test the command** by using it with appropriate arguments