chore: bump version to 1.1.6 (#1076)

Patch release: installer prunes old version bundles (#1074) and
`codegraph index` rebuilds an oversized index without wedging (#1067).

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@colbymchenry/codegraph",
-  "version": "1.1.5",
+  "version": "1.1.6",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@colbymchenry/codegraph",
-      "version": "1.1.5",
+      "version": "1.1.6",
       "license": "MIT",
       "dependencies": {
         "@clack/prompts": "^1.3.0",