feat: add claude code plugin support (#1293)

Co-authored-by: Claude <noreply@anthropic.com>

.changeset/mean-planes-wave.md

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+---
+"task-master-ai": minor
+---
+
+Add Claude Code plugin with marketplace distribution
+
+This release introduces official Claude Code plugin support, marking the evolution from legacy `.claude` directory copying to a modern plugin-based architecture.
+
+## 🎉 New: Claude Code Plugin
+
+Task Master AI commands and agents are now distributed as a proper Claude Code plugin:
+
+- **49 slash commands** with clean naming (`/task-master-ai:command-name`)
+- **3 specialized AI agents** (task-orchestrator, task-executor, task-checker)
+- **MCP server integration** for deep Claude Code integration
+
+**Installation:**
+
+```bash
+/plugin marketplace add eyaltoledano/claude-task-master
+/plugin install taskmaster@taskmaster
+```
+
+### The `rules add claude` command no longer copies commands and agents to `.claude/commands/` and `.claude/agents/`. Instead, it now
+
+- Shows plugin installation instructions
+- Only manages CLAUDE.md imports for agent instructions
+- Directs users to install the official plugin
+
+**Migration for Existing Users:**
+
+If you previously used `rules add claude`:
+
+1. The old commands in `.claude/commands/` will continue to work but won't receive updates
+2. Install the plugin for the latest features: `/plugin install taskmaster@taskmaster`
+3. remove old `.claude/commands/` and `.claude/agents/` directories
+
+**Why This Change?**
+
+Claude Code plugins provide:
+
+- ✅ Automatic updates when we release new features
+- ✅ Better command organization and naming
+- ✅ Seamless integration with Claude Code
+- ✅ No manual file copying or management
+
+The plugin system is the future of Task Master AI integration with Claude Code!