chore(deps): override @babel/core to ^7.29.6 (CVE fix) (#1712)

Resolves Dependabot alert #132. Uses a version-targeted override
(@babel/core@<=7.29.0) so all copies of the vulnerable range are bumped.
Part of #1706.


Claude-Session: https://claude.ai/code/session_01HiccCEh9mwCfVzE8qYcop1

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

package.json

@@ -81,7 +81,8 @@
     "get-intrinsic": "1.3.0",
     "shell-quote": "^1.8.4",
     "hono": "^4.12.25",
-    "form-data": "^4.0.6"
+    "form-data": "^4.0.6",
+    "@babel/core@<=7.29.0": "^7.29.6"
   },
   "engines": {
     "node": ">=22.7.5"