feat(build): support independently deployed worker stages

[james-elicx]

Summary

• let adapters add independently deployable request and response build entries
• preserve existing host inputs and reject reserved entry-name collisions
• demonstrate an adapter-owned HTTP transport between two separate Node processes
• preserve build identity, request authority, pregenerated-path state, PPR guards, revalidation, streaming, static assets, and forged-metadata rejection across that transport

The Cloudflare adapter does not use output.entries; it remains on the preceding PR and owns its ctx.exports transport.

Stack

1. tooling baseline (chore(deps): update Cloudflare Workers tooling #3082)
2. transport-neutral worker stages (feat(build): add transport-neutral worker stages #3083)
3. Cloudflare Workers Cache entrypoint isolation (feat(cloudflare): isolate Workers Cache with staged entrypoints #3079)
4. This PR: independently deployed HTTP stages (feat(build): support independently deployed worker stages #3084)
5. Workers Cache tag parity (fix(cloudflare): preserve Workers Cache tag parity #3085)

Validation

• independent HTTP-stage regression suite: 13 passed
• full vp check and Knip: passed at the stack head
• vinext and @vinext/cloudflare builds: passed

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@3084

npm i https://pkg.pr.new/create-vinext-app@3084

npm i https://pkg.pr.new/@vinext/types@3084

npm i https://pkg.pr.new/vinext@3084

commit: 9055733

[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 64bc548 against base 23fb088 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	142.4 KB	142.4 KB	⚫ -0.0%
Client entry size (gzip)	vinext	129.6 KB	129.6 KB	⚫ -0.0%
Dev server cold start	vinext	3.38 s	3.32 s	🟢 -1.7%
Production build time	vinext	3.74 s	3.76 s	⚫ +0.6%
RSC entry closure size (gzip)	vinext	125.7 KB	125.7 KB	⚫ -0.0%
Server bundle size (gzip)	vinext	216.4 KB	216.4 KB	⚫ -0.0%

View detailed results and traces

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

[james-elicx]

Superseded by the optional HTTP transport layer in #3155.