chore: regenerate golden install-tree fixtures for the new lib file

scripts/lib/npm-version-check-diagnosis.cjs (added in the previous
commit) is a new shipped file under the "scripts" files-glob, so it
needs to appear in every runtime's golden install-tree fixture.
Confirmed by gsd-test: 23 tests/golden-install-tree.test.cjs failures,
one per runtime, each showing the same single added path. Ran
npm run gen:install-tree; diff is exactly one line per fixture file,
matching the new file.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/fixtures/install-tree/opencode.json

@@ -639,6 +639,7 @@
   "scripts/lib/drift-scan.cjs",
   "scripts/lib/exit-code-registry.cjs",
   "scripts/lib/ndjson-reporter.cjs",
+  "scripts/lib/npm-version-check-diagnosis.cjs",
   "scripts/lib/shellcheck-fetch.cjs",
   "skills/gsd-add-tests/SKILL.md",
   "skills/gsd-ai-integration-phase/SKILL.md",