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

render-mcp.yaml

@@ -0,0 +1,17 @@
+services:
+  # MCP Server Service (HTTP mode)
+  - type: web
+    name: skill-seekers-mcp
+    runtime: docker
+    plan: free
+    dockerfilePath: ./Dockerfile.mcp
+    envVars:
+      - key: MCP_PORT
+        value: "8765"
+      - key: PORT
+        fromService:
+          type: web
+          name: skill-seekers-mcp
+          property: port
+    healthCheckPath: /health
+    autoDeploy: true