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/doc-guardian/commands/doc.md

@@ -1,17 +1,26 @@
 ---
-description: Documentation management and drift detection
+name: doc
+description: Documentation management and drift detection — type /doc <action> for commands
 ---
 
 # /doc
 
 Documentation management, drift detection, and synchronization.
 
-## Sub-commands
+When invoked without a sub-command, display available actions and ask which to run.
 
-| Sub-command | Description |
-|-------------|-------------|
+## Available Commands
+
+| Command | Description |
+|---------|-------------|
 | `/doc audit` | Full documentation audit - scans for doc drift |
 | `/doc sync` | Synchronize pending documentation updates |
 | `/doc changelog-gen` | Generate changelog from conventional commits |
 | `/doc coverage` | Documentation coverage metrics by function/class |
 | `/doc stale-docs` | Flag documentation behind code changes |
+
+## Workflow
+
+1. Display the table above
+2. Ask: "Which command would you like to run?"
+3. Route to the selected sub-command