feat: add disable-model-invocation to workflow commands

Prevent SlashCommand tool from programmatically invoking complex
8-phase workflow commands that require significant user interaction
and decision-making at multiple phases.

Commands updated:
- create-plugin.md
- create-marketplace.md

Fixes #135

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: sjnims

plugins/plugin-dev/commands/create-marketplace.md

@@ -2,6 +2,7 @@
 description: Create plugin marketplaces with guided workflow
 argument-hint: [marketplace-description]
 allowed-tools: Read, Write, Edit, Grep, Glob, Bash(mkdir:*), Bash(git init:*), TodoWrite, AskUserQuestion, Skill, Task
+disable-model-invocation: true
 ---
 
 # Marketplace Creation Workflow

plugins/plugin-dev/commands/create-plugin.md

@@ -2,6 +2,7 @@
 description: Create plugins with guided 8-phase workflow
 argument-hint: [plugin-description]
 allowed-tools: Read, Write, Edit, Grep, Glob, Bash(mkdir:*), Bash(git init:*), TodoWrite, AskUserQuestion, Skill, Task
+disable-model-invocation: true
 ---
 
 # Plugin Creation Workflow