Add codegraph_explore tool and expand exclude patterns

- Add codegraph_explore MCP tool for deep exploration with condensed output
- Expand default exclude patterns for framework build outputs (.next, .nuxt, .expo, etc.)
- Increase node ID hash length from 16 to 32 chars to prevent collisions
- Add feature request detection with UX clarification reminders
- Update README with MCP tools reference and best practices
- Update CLAUDE.md with context usage guidelines

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@colbymchenry/codegraph",
-  "version": "0.1.4",
+  "version": "0.1.5",
   "description": "A local-first code intelligence system that builds a semantic knowledge graph from any codebase",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",