feat(build): support independently deployed worker stages

[james-elicx]

Part 16 of 16 in the staged CDN adapter stack. Depends on #3154.

Summary

• adds optional named request/response build entries for adapters that deploy stages independently
• proves an authenticated over-HTTP transport across separate Node processes
• requires every admitted Vary selector to be present in the host cache identity
• keeps cache-hit entrypoints lazy and preserves host-owned inputs/output semantics
• colocates client, action-owner, and pregenerated-path sidecars with every array-shaped response output, including transform-only adapters such as cdnAdapter()
• rejects CommonJS, umd, and iife outputs, which cannot load the ESM sidecars or represent independent named stage chunks

This optional layer remains last so the Cloudflare same-Worker entrypoint design does not depend on HTTP deployment support.

Validation

• 18/18 independent HTTP transport tests
• actual two-output App and Pages builds cover explicit stage entries and transform-only adapter output
• 562 focused build, deploy, and Cloudflare Worker tests passed; 2 skipped
• full vp check, Knip, and vinext/Cloudflare package builds

Review size

• Implementation: +194 / -56 LOC
• Tests and fixtures: +1863 / -2 LOC
• Other (docs, config, lockfile): +0 / -0 LOC
• 33 changed files

Measured against codex/cdn-v2-cloudflare-docs after rebasing onto main@a6931c0.

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@3155

npm i https://pkg.pr.new/create-vinext-app@3155

npm i https://pkg.pr.new/@vinext/types@3155

npm i https://pkg.pr.new/vinext@3155

commit: b3ff95d

[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
static-export	preview	production
web	preview	production

[github-actions]

Performance benchmarks

Compared b3ff95d against base 8f09eb5 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	142.4 KB	142.4 KB	⚫ +0.0%
Client entry size (gzip)	vinext	129.6 KB	129.7 KB	⚫ +0.0%
Dev server cold start	vinext	3.24 s	3.22 s	⚫ -0.6%
Production build time	vinext	3.39 s	3.40 s	⚫ +0.2%
RSC entry closure size (gzip)	vinext	125.5 KB	125.5 KB	⚫ +0.0%
Server bundle size (gzip)	vinext	216.2 KB	216.2 KB	⚫ -0.0%

View detailed results and traces

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

[james-elicx]

/bigbonk review for issues

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Posted 2 actionable inline findings on exact head 80e5eea.

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[james-elicx]

/bigbonk review for issues

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Posted 1 actionable inline finding on exact head b75b550.

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[ask-bonk]

LGTM!

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[james-elicx]

/bigbonk review for issues

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[james-elicx]

/bigbonk review for issues

Retry after the prior workflow was cancelled without a verdict. Please review exact head 321c507, complete within an 8 minute time limit, and report only actionable issues in this PR.

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LGTM!

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