feat: add distribution files for Smithery, GitHub Action, and Claude Code Plugin

- Add Claude Code Plugin: plugin.json, .mcp.json, 3 slash commands, skill-builder agent skill
- Add GitHub Action: composite action.yml with 6 inputs/2 outputs, comprehensive README
- Add Smithery: publishing guide with namespace yusufkaraaslan/skill-seekers created
- Add render-mcp.yaml for MCP server deployment on Render
- Fix Dockerfile.mcp: --transport flag (nonexistent) → --http, add dynamic PORT support
- Update AGENTS.md to v3.3.0 with corrected test count and expanded CI section
- Allow distribution/claude-plugin/.mcp.json in .gitignore

distribution/claude-plugin/.claude-plugin/plugin.json

@@ -0,0 +1,11 @@
+{
+  "name": "skill-seekers",
+  "description": "Transform 17 source types (docs, GitHub, PDFs, videos, Jupyter, Confluence, Notion, Slack, and more) into AI-ready skills and RAG knowledge for 16+ LLM platforms.",
+  "version": "3.3.0",
+  "author": {
+    "name": "Yusuf Karaaslan"
+  },
+  "homepage": "https://github.com/yusufkaraaslan/Skill_Seekers",
+  "repository": "https://github.com/yusufkaraaslan/Skill_Seekers",
+  "license": "MIT"
+}