Hybrid approach: Explore agents use CodeGraph for faster lookups

Updated documentation to recommend instructing Explore agents to use
CodeGraph tools (search, callers, callees, context) for faster code
exploration instead of file scanning.

Benchmark results show ~30% fewer tokens and ~25% fewer tool calls
when Explore agents leverage CodeGraph for graph-based lookups.

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@colbymchenry/codegraph",
-  "version": "0.1.8",
+  "version": "0.1.9",
   "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",