feat(tracing): add App segment module spans

[james-elicx]

Summary

• emit the stable NextNodeServer.createComponentTree and NextNodeServer.getLayoutOrPageModule hierarchy through the shared framework tracer
• trace only selected App Router page/layout modules, including named and sibling interception branches, while keeping default-only and inactive slots hidden
• preserve exact Next.js segment identities for __PAGE__, route groups/dynamic segments, and named slot roots ((__SLOT__))
• prove the hierarchy with the unchanged real @sentry/nextjs integration on Workerd

Next.js parity

Pinned against vercel/next.js@b421cadefd31c1b59d117842021ded7c1ebaf5b4, especially:

• packages/next/src/server/app-render/create-component-tree.tsx
• packages/next/src/server/lib/app-dir-module.ts
• packages/next/src/server/lib/trace/constants.ts
• test/e2e/opentelemetry/instrumentation/opentelemetry.test.ts

Present page/layout modules emit even when their default export is invalid, while defaultPage remains hidden exactly as in Next.js. Eagerly hydrated inactive slot modules do not create spans.

No OpenTelemetry package is added as a required vinext dependency, and no Sentry-specific runtime path is introduced. The same descriptors flow to Workers tracing automatically.

Validation

• vp check
• focused App tracing/tree/wiring/framework/Workers suites (173 passed)
• vp run vinext#build
• PLAYWRIGHT_PROJECT=cloudflare-sentry-app pnpm run test:e2e (17 passed)
• independent correctness review: clean after addressing default-only slots and sibling-interception paths
• independent Next.js parity review: clean after adding the component-tree parent, exact named-slot identity, module-presence behavior, and missing-default ancestor spans

Stack parent: #3269

[james-elicx]

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@vinext/cloudflare

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create-vinext-app

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@vinext/types

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vinext

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@cloudflare/workers-response-store

npm i https://pkg.pr.new/cloudflare/vinext/@cloudflare/workers-response-store@3270

commit: 09ffc24

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[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
response-store-demo	preview	production
static-export	preview	production
web	preview	production

[github-actions]

Performance benchmarks

Compared 09ffc24 against base 098e10a 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	142.3 KB	142.3 KB	⚫ +0.0%
Client entry size (gzip)	vinext	129.7 KB	129.7 KB	⚫ +0.0%
Dev server cold start	vinext	3.42 s	3.38 s	⚫ -1.2%
Production build time	vinext	3.94 s	3.93 s	⚫ -0.2%
RSC entry closure size (gzip)	vinext	125.0 KB	125.3 KB	⚫ +0.3%
Server bundle size (gzip)	vinext	215.6 KB	215.9 KB	⚫ +0.1%

View detailed results and traces

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