test(pack): list ensureAndroidCacheDir.mjs in the pack-artifact fixture

#8593 registered bin/cli/utils/ensureAndroidCacheDir.mjs in
PACK_ARTIFACT_REQUIRED_PATHS so the Android/Termux cache module cannot silently
drop out of the npm tarball. Three test files read that list; only
pack-artifact-entrypoint-closures.test.ts derives it dynamically. This one
hardcodes the expected set, so it went red on a correct change.

Adding the entry here, not relaxing the assertion — a hardcoded fixture is what
makes an accidental REMOVAL from the required-paths list loud, which is the
whole point of the guard.

changelog.d/maintenance/train2-pack-artifact-and-ratchet.md

@@ -0,0 +1 @@
+- chore(quality): align the pack-artifact expected-path fixture with the Android/Termux cache module added in #8593, and re-pin the `chatCore.ts` ceiling grown by the merge-train 2 batch

tests/unit/pack-artifact-policy.test.ts

@@ -109,6 +109,7 @@ test("findMissingArtifactPaths flags missing root runtime files in the tarball",
     "bin/aliasResolverHook.mjs",
     "bin/cli/data-dir.mjs",
     "bin/cli/program.mjs",
+    "bin/cli/utils/ensureAndroidCacheDir.mjs",
     "bin/cli/utils/storageKeyProvision.mjs",
     "bin/cli/utils/versionFastPath.mjs",
     "bin/mcp-server.mjs",