chore(deps): bump @paperclipai/adapter-utils from canary.7 pin to ^2026.428.0

The peerDep floor and devDep were pinned to a pre-release canary from
April 15, 13 days behind the current stable. Move both to the latest
stable 2026.428.0. All 328 tests pass against the new types; the
imported surface (asString, parseObject, runChildProcess,
AdapterExecutionContext, etc.) is unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -38,10 +38,10 @@
     "picocolors": "^1.1.1"
   },
   "peerDependencies": {
-    "@paperclipai/adapter-utils": ">=2026.415.0-canary.7"
+    "@paperclipai/adapter-utils": ">=2026.428.0"
   },
   "devDependencies": {
-    "@paperclipai/adapter-utils": "2026.415.0-canary.7",
+    "@paperclipai/adapter-utils": "^2026.428.0",
     "@types/node": "^24.6.0",
     "@vitest/coverage-v8": "^4.1.4",
     "esbuild": "^0.24.0",