test(cloudflare): preserve independent RSC warm proof

[james-elicx]

Summary

• make promotion readiness poll only the unique no-store version endpoint
• include both the app build ID and RSC build ID in that endpoint
• leave both canonical RSC cache keys untouched until their first HIT assertions
• retry only responses positively identified as the stale seed Worker; current-build MISS, BYPASS, wrong content, or wrong build still fail immediately

Test plan

• vp check examples/workers-cache/app/api/prewarm-version/route.ts tests/e2e/cloudflare-workers/rsc-prewarm.spec.ts
• PLAYWRIGHT_PROJECT=cloudflare-workers vp exec playwright test tests/e2e/cloudflare-workers/rsc-prewarm.spec.ts --list
• deployed Cloudflare proof in CI

Stacked on #3019.

[github-actions]

Performance benchmarks

Compared 9d352a2 against base d7f6655 using alternating same-runner rounds. Next.js was unchanged and skipped.

1 improved · 0 regressed · 5 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	142.0 KB	142.0 KB	⚫ -0.0%
Client entry size (gzip)	vinext	129.3 KB	129.3 KB	⚫ -0.0%
Dev server cold start	vinext	3.27 s	3.18 s	🟢 -2.7%
Production build time	vinext	3.40 s	3.37 s	⚫ -0.8%
RSC entry closure size (gzip)	vinext	116.0 KB	116.0 KB	⚫ 0.0%
Server bundle size (gzip)	vinext	197.5 KB	197.5 KB	⚫ -0.0%

View detailed results and traces

_{🟢 improvement · 🔴 regression · ⚫ change below 1.5% · paired base/head}

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@3020

npm i https://pkg.pr.new/create-vinext-app@3020

npm i https://pkg.pr.new/@vinext/types@3020

npm i https://pkg.pr.new/vinext@3020

commit: 9d352a2

[github-actions]

Example	Preview	Production	Original
app-router-cloudflare	preview	production
pages-router-cloudflare	preview	production
app-router-playground	preview	production	original
realworld-api-rest	preview	production
nextra-docs-template	preview	production
benchmarks	preview	production
hackernews	preview	production	original
workers-cache	preview	production
web	preview	production