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/code-sentinel/commands/sentinel.md

@@ -1,15 +1,24 @@
 ---
-description: Security scanning and code refactoring
+name: sentinel
+description: Security scanning and code refactoring — type /sentinel <action> for commands
 ---
 
 # /sentinel
 
 Security scanning and safe code refactoring tools.
 
-## Sub-commands
+When invoked without a sub-command, display available actions and ask which to run.
 
-| Sub-command | Description |
-|-------------|-------------|
+## Available Commands
+
+| Command | Description |
+|---------|-------------|
 | `/sentinel scan` | Full security audit (SQL injection, XSS, secrets, etc.) |
 | `/sentinel refactor` | Apply refactoring patterns to improve code |
 | `/sentinel refactor-dry` | Preview refactoring without applying changes |
+
+## Workflow
+
+1. Display the table above
+2. Ask: "Which command would you like to run?"
+3. Route to the selected sub-command