fix(cloudflare): validate CDN warm responses against deployed builds

[james-elicx]

Summary

Consolidates the response-validation and build-identity hardening previously split across #3021–#3026.

• validate effective Cloudflare cache policy, shared freshness, cache admission status, cookies, and exact supported Vary
• retry only failed staged requests after the initial queue and distinguish transient old-build responses from permanent same-build failures
• expose generic adapter-owned build identity at the outer App and Pages response boundary
• require verifiable HTML build identity where strict/no-promote semantics depend on it, while retaining canonical RSC warming for capable adapters
• resolve concrete App/Pages ownership before emitting RSC warm targets, including hybrid i18n routes
• keep warmup bound to the uploaded Worker build and still apply triggers after promotion

Scope

Only canonical RSC/ISR CDN warm planning, response validation, and staged deploy orchestration. No middleware, TPR, development-mode, cross-version-cache, or generic caching changes.

Validation

The retained commits keep their focused cache, adapter, discovery, deploy, and Worker tests. The cumulative exact head has passed the complete CI suite and deployed browser-reuse proof.

Consolidates #3021, #3022, #3023, #3024, #3025, and #3026. Stacked on #3020.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@3026

npm i https://pkg.pr.new/create-vinext-app@3026

npm i https://pkg.pr.new/@vinext/types@3026

npm i https://pkg.pr.new/vinext@3026

commit: b88d125

[github-actions]

Performance benchmarks

Compared b88d125 against base 011d187 using alternating same-runner rounds. Next.js was unchanged and skipped.

0 improved · 0 regressed · 6 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	2.20 s	2.20 s	⚫ -0.3%
Production build time	vinext	2.37 s	2.36 s	⚫ -0.4%
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}

[james-elicx]

Superseded by consolidated PR #3040. No commits were dropped or rewritten: #3040 now contains this exact linear commit as part of #3021–#3040. Closing only the redundant draft PR.