feat: Add project-mcp-setup skill for quick .mcp.json generation

Adds new skill to quickly generate project-specific .mcp.json files with
pre-configured templates for common use cases:
- Technical: Full MCP suite for software development
- Prose: Writing-focused MCPs only
- Minimal: Just memory essentials
- Custom: User-specified MCPs

Eliminates need to look up MCP configurations for each new project.
Bump version to 1.3.0.

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

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

claude-code/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "claude-code",
   "description": "Comprehensive skills for mastering Claude Code features: plugins, skills, slash commands, hooks, subagents, and memory management",
-  "version": "1.2.0",
+  "version": "1.3.0",
   "author": {
     "name": "Claude Skills Contributors"
   },