chore: upgrade @ocas/* to ^0.3.0, migrate better-sqlite3 → node:sqlite

- @ocas/core and @ocas/fs upgraded from ^0.2.2 to ^0.3.0
- agent-hermes: replace better-sqlite3 with node:sqlite (DatabaseSync)
- Remove better-sqlite3 and @types/better-sqlite3 dependencies
- Fix remaining bun references in cli test helpers (execFileSync)

Refs #28

packages/agent-hermes/package.json

@@ -22,14 +22,12 @@
     "test:ci": "vitest run __tests__/"
   },
   "dependencies": {
-    "@ocas/core": "^0.2.2",
+    "@ocas/core": "^0.3.0",
     "@united-workforce/protocol": "workspace:^",
     "@united-workforce/util": "workspace:^",
-    "@united-workforce/util-agent": "workspace:^",
-    "better-sqlite3": "^12.10.0"
+    "@united-workforce/util-agent": "workspace:^"
   },
   "devDependencies": {
-    "@types/better-sqlite3": "^7.6.13",
     "typescript": "^5.8.3"
   },
   "publishConfig": {