refactor(build): add in-house CommonJS transform

[james-elicx]

Summary

• add a scope-aware internal transform for static require(), module.exports, and named CommonJS exports
• use existing vinext AST/scope/source-map utilities with collision-safe helpers
• port the upstream Next.js extensionless patterned dynamic-require fixture as characterization coverage for the follow-up

Stack

1. This PR: internal transformation foundation and characterization tests
2. refactor(build): remove vite-plugin-commonjs #2981: wire application/config pipelines, internalize patterned resolution, validate all runtimes, and remove vite-plugin-commonjs

Both PRs are drafts. #2981 intentionally targets this branch.

Validation

• vp test run tests/commonjs-transform.test.ts
• vp test run tests/cjs.test.ts
• focused vp check
• Pages Router production Playwright patterned-require test
• full CI, deploy examples, and smoke tests green on e268057

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@2980

npm i https://pkg.pr.new/create-vinext-app@2980

npm i https://pkg.pr.new/@vinext/types@2980

npm i https://pkg.pr.new/vinext@2980

commit: 3267dfd

[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 3267dfd against base 2dcd9f2 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	140.3 KB	140.3 KB	⚫ +0.0%
Client entry size (gzip)	vinext	127.7 KB	127.7 KB	⚫ +0.0%
Dev server cold start	vinext	3.18 s	3.13 s	🟢 -1.8%
Production build time	vinext	3.54 s	3.51 s	⚫ -1.0%
RSC entry closure size (gzip)	vinext	115.2 KB	115.3 KB	⚫ +0.1%
Server bundle size (gzip)	vinext	196.4 KB	196.5 KB	⚫ +0.1%

View detailed results and traces

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