feat(commands): make dispatch files active command handlers

All 25 dispatch files now have name: in frontmatter with Workflow
section that displays sub-commands and prompts for selection.
Bare /noun invocation is now useful instead of a dead end.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/project-hygiene/commands/hygiene.md

@@ -0,0 +1,22 @@
+---
+name: hygiene
+description: Project hygiene checks — type /hygiene <action> for commands
+---
+
+# /hygiene
+
+Manual project hygiene checks for file organization and cleanup.
+
+When invoked without a sub-command, display available actions and ask which to run.
+
+## Available Commands
+
+| Command | Description |
+|---------|-------------|
+| `/hygiene check` | Run project hygiene checks (temp files, misplaced files, empty dirs) |
+
+## Workflow
+
+1. Display the table above
+2. Ask: "Which command would you like to run?"
+3. Route to the selected sub-command