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
• cover App, Pages, API, revalidation, streaming, static assets, and forged transport metadata

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

• CI: all 68 checks passed
• independent HTTP stages: 8/8
• build/config coverage: 188 passed, 2 skipped
• targeted vp check 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: a5a3fc1

[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

[github-actions]

Performance benchmarks

Compared a5a3fc1 against base 379ae5b using alternating same-runner rounds. Next.js was unchanged and skipped.

1 improved · 1 regressed · 4 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	142.2 KB	142.2 KB	⚫ +0.0%
Client entry size (gzip)	vinext	129.5 KB	129.5 KB	⚫ +0.0%
Dev server cold start	vinext	2.43 s	2.39 s	🟢 -1.9%
Production build time	vinext	2.43 s	2.50 s	🔴 +3.0%
RSC entry closure size (gzip)	vinext	121.1 KB	121.1 KB	⚫ +0.0%
Server bundle size (gzip)	vinext	205.0 KB	205.0 KB	⚫ +0.0%

View detailed results and traces

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