FAP-WEB-LLMS-FEED-CACHE-OPS-NODE22-REPAIR-01: make llms feed cache ops readback Node 22 compatible

[fermatmind]

What changed

• Wrapped the LLMS Feed Cache Ops production readback awaits inside an async main() function.
• Kept CommonJS require() in the heredoc and added fail-closed main().catch(...) handling.
• Added a focused contract assertion to prevent top-level await from returning to this Node heredoc.

Why

GitHub runner Node 22 rejects heredoc scripts that mix require() with top-level await as ambiguous module syntax. The previous cache-only ops run reached PM2 reload, then failed before feed readback and artifact upload.

Validation

• pnpm exec vitest run tests/contracts/llms-feed-cache-ops-workflow.contract.test.ts
• actionlint .github/workflows/llms-feed-cache-ops.yml
• node scripts/verify-github-action-refs.mjs --resolve
• pnpm typecheck
• git diff --check

Deferred items

• No deployment.
• No CMS writes or eligibility changes.
• No Search Queue or IndexNow.
• No llms feed cache ops rerun in this PR; rerun after merge.

Repository rule impact

Workflow runtime-only repair. No content authority, public API, sitemap, llms enumeration, CMS ownership, or frontend fallback boundary changes.