fix: correct installation method to project-local plugin

**Problem:**
- Previous commit (a302ca7) added `make install-plugin` that copied to ~/.claude/plugins/
- This breaks path references - plugins are designed to be project-local
- Wasted effort with install/uninstall commands

**Root Cause:**
- Misunderstood Claude Code plugin architecture
- Plugins use project-local `.claude-plugin/` directory
- Claude Code auto-detects when started in project directory
- No copying or installation needed

**Solution:**
- Remove `make install-plugin`, `uninstall-plugin`, `reinstall-plugin`
- Update README.md: Just `cd SuperClaude_Framework && claude`
- Remove ~/.claude/plugins/pm-agent/ (incorrect location)
- Simplify to zero-install approach

**Correct Usage:**
```bash
git clone https://github.com/SuperClaude-Org/SuperClaude_Framework.git
cd SuperClaude_Framework
claude  # .claude-plugin/ auto-detected
```

**Benefits:**
- Zero install: No file copying
- Hot reload: Edit TypeScript → Save → Instant reflection
- Safe development: Separate from global Claude Code
- Auto-activation: SessionStart hook runs /pm automatically

**Changes:**
- Makefile: Remove install-plugin, uninstall-plugin, reinstall-plugin targets
- README.md: Replace `make install-plugin` with `cd + claude`
- Cleanup: Remove ~/.claude/plugins/pm-agent/ directory

**Acknowledgment:**
Thanks to user for explaining Local Installer architecture:
- ~/.claude/local = separate sandbox from npm global version
- Project-local plugins = safe experimentation
- Hot reload more stable in local environment

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

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

Makefile

@@ -1,4 +1,4 @@
-.PHONY: dev install test test-plugin doctor verify clean lint format install-plugin uninstall-plugin reinstall-plugin help
+.PHONY: dev install test test-plugin doctor verify clean lint format help
 
 # Development installation (local source, editable) - RECOMMENDED
 dev:
@@ -64,46 +64,6 @@ clean:
 	find . -type d -name .pytest_cache -exec rm -rf {} +
 	find . -type d -name .ruff_cache -exec rm -rf {} +
 
-# Install Claude Code plugin
-install-plugin:
-	@echo "🔌 Installing SuperClaude plugin to Claude Code..."
-	@if [ -d ~/.claude/plugins/pm-agent ]; then \
-		echo "⚠️  Plugin already exists at ~/.claude/plugins/pm-agent"; \
-		echo "   Run 'make reinstall-plugin' to update"; \
-		exit 1; \
-	fi
-	@mkdir -p ~/.claude/plugins/pm-agent
-	@cp -r .claude-plugin/* ~/.claude/plugins/pm-agent/
-	@echo ""
-	@echo "✅ Plugin installed successfully!"
-	@echo ""
-	@echo "📋 Installed components:"
-	@echo "   - PM Agent: Auto-activation orchestrator (SessionStart hook)"
-	@echo "   - Research: Deep web search with adaptive planning"
-	@echo "   - Index: Repository indexing (94% token reduction)"
-	@echo ""
-	@echo "🔄 Restart Claude Code or run /plugin to verify installation"
-	@echo "   Available commands: /pm, /research, /index-repo"
-
-# Uninstall Claude Code plugin
-uninstall-plugin:
-	@echo "🗑️  Uninstalling SuperClaude plugin..."
-	@if [ ! -d ~/.claude/plugins/pm-agent ]; then \
-		echo "❌ Plugin not found at ~/.claude/plugins/pm-agent"; \
-		exit 1; \
-	fi
-	@rm -rf ~/.claude/plugins/pm-agent
-	@echo "✅ Plugin uninstalled successfully"
-
-# Reinstall Claude Code plugin (uninstall + install)
-reinstall-plugin:
-	@echo "🔄 Reinstalling SuperClaude plugin..."
-	@rm -rf ~/.claude/plugins/pm-agent 2>/dev/null || true
-	@mkdir -p ~/.claude/plugins/pm-agent
-	@cp -r .claude-plugin/* ~/.claude/plugins/pm-agent/
-	@echo "✅ Plugin reinstalled successfully"
-	@echo "🔄 Restart Claude Code to apply changes"
-
 # Translate README to multiple languages using Neural CLI
 translate:
 	@echo "🌐 Translating README using Neural CLI (Ollama + qwen2.5:3b)..."
@@ -130,7 +90,6 @@ help:
 	@echo "🚀 Quick Start:"
 	@echo "  make dev             - Install in development mode (RECOMMENDED)"
 	@echo "  make verify          - Verify installation is working"
-	@echo "  make install-plugin  - Install plugin to Claude Code (~/.claude/plugins/)"
 	@echo ""
 	@echo "🔧 Development:"
 	@echo "  make test            - Run test suite"
@@ -140,14 +99,13 @@ help:
 	@echo "  make format          - Format code (ruff format)"
 	@echo "  make clean           - Clean build artifacts"
 	@echo ""
-	@echo "🔌 Plugin Management:"
-	@echo "  make install-plugin  - Install plugin to Claude Code"
-	@echo "  make uninstall-plugin - Remove plugin from Claude Code"
-	@echo "  make reinstall-plugin - Update existing plugin installation"
-	@echo ""
 	@echo "📚 Documentation:"
 	@echo "  make translate       - Translate README to Chinese and Japanese"
 	@echo "  make help            - Show this help message"
 	@echo ""
+	@echo "💡 Plugin Usage:"
+	@echo "  cd /path/to/SuperClaude_Framework && claude"
+	@echo "  → .claude-plugin/ auto-detected (project-local plugin)"
+	@echo ""
 	@echo "💡 Legacy (backward compatibility):"
 	@echo "  make install         - Alias for 'make dev'"