test(hermes): cover branch metadata snapshot URL resolution

[Saad Najmi (Saadnajmi)]

Current release stack

• Tracker: React Native macOS 0.83–0.87: PR stack and release tracker #3098
• Position: 16 of 17.
• Review base: review/0.87-stable-sync. Retarget as predecessors land; stable releases retain separate stable branches.
• Current source: the PR's Commits tab tracks the latest repaired branch head.

Depends on #3100. Add Hermes snapshot URL regression coverage. #3107 follows directly in the active review sequence.

Validation and backups

The branch-specific repaired source passed hardened immutable installation, constraints, and its complete release-helper selection. The selected 18-head packet records 1,406 passing helper tests. Exact source-tree equivalence is used for rewritten endpoints where applicable; the two changed linear RC checkpoints were tested separately.

Native/API evidence retains its recorded scope. The SwiftPM and RNTester repairs have six focused native build passes. Public stable versions and runtime/API contents were preserved except for the independently reviewed SwiftPM destination repair where applicable.

Public-registry lock correction passed all 18 hosted generation, hardened immutable, constraints, and metadata-audit jobs in run 35769816507. Only equivalent executable-path spelling changes are permitted; dependency versions, checksums, and ranges are unchanged. The previous functional test results remain applicable to this metadata-only correction. Fresh GitHub CI and review remain required. Previous heads are preserved on the same repository under backup/pre-ci-repair-20260922/<original-branch> and backup/pre-public-registry-20260922/<original-branch>; local complete-history bundles were verified as well.

The 0.87 PR sequence is one first-parent path: #3037 → #3104 → #3105 → #3106 → #3100 → #3101 → #3107. The redundant #3102/#3103 reviews are consolidated into #3105.

This section supersedes earlier stack order, source identity, and validation-status notes below.

Final CI follow-up

This branch receives only these independently reviewed follow-up paths:

• .github/workflows/microsoft-npm-publish.yml
• .github/workflows/microsoft-pr.yml
• packages/react-native/ReactNativeApi.d.ts
• packages/react-native/scripts/ios-prebuild/__tests__/headers-conditional-test.js
• packages/react-native/scripts/ios-prebuild/__tests__/hermes-test.js
• packages/react-native/scripts/ios-prebuild/__tests__/reactNativeDependencies-test.js

The complete 16-head batch passed 92 recorded validation commands, including branch-specific API revalidation/generated TypeScript, full formatting checks, and combined targeted suites where applicable. Native changes are limited to the reviewed #3033 destination guards (also present in stable 0.85) and #3104's sidecar-copy correction (already present in its descendants). Exact source equivalence preserves earlier native results elsewhere. The public-registry lockfiles and package manifests remain byte-identical.

Previous heads are backed up at backup/pre-ci-followup-20260922/<original-branch> on their source repository. Fresh current-head CI remains required. The one-first-parent 0.87 sequence is preserved.

Flow/lint closeout

This branch receives the reviewed Flow annotation/test-fixture or duplicate Jest mapper correction. Full Flow, ESLint, and format checks pass; generator output/runtime AST or effective Jest mapper behavior remain equivalent as applicable. Public-registry locks, package manifests, and API declarations remain unchanged. Backups are verified under backup/pre-flow-lint-20260922/<original-branch>. The single first-parent PR path is preserved; current-head CI remains the final acceptance gate.