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/pr-review/commands/pr.md

@@ -1,15 +1,18 @@
 ---
-description: Pull request review and management
+name: pr
+description: Pull request review and management — type /pr <action> for commands
 ---
 
 # /pr
 
 Multi-agent pull request review with confidence scoring.
 
-## Sub-commands
+When invoked without a sub-command, display available actions and ask which to run.
 
-| Sub-command | Description |
-|-------------|-------------|
+## Available Commands
+
+| Command | Description |
+|---------|-------------|
 | `/pr review` | Full multi-agent PR review with confidence scoring |
 | `/pr summary` | Quick summary of PR changes |
 | `/pr findings` | List and filter review findings by category/severity |
@@ -17,3 +20,9 @@ Multi-agent pull request review with confidence scoring.
 | `/pr init` | Quick project setup for PR reviews |
 | `/pr sync` | Sync config with git remote after repo move/rename |
 | `/pr setup` | Setup wizard for pr-review |
+
+## Workflow
+
+1. Display the table above
+2. Ask: "Which command would you like to run?"
+3. Route to the selected sub-command