perf(core): load replay page from run_started

[NathanColosimo]

Summary

• negotiate a framed run_started response containing the first replay page for ordinary and resumed invocations
• continue replay from the returned cursor without reloading the first page
• preserve the existing Turbo path: background run_started, request skipPreload, synthesize the run, and begin replay immediately
• preserve raw compressed replay payloads until runtime hydration

Stack

Stacked on #3124.

Validation

• pnpm typecheck
• pnpm --filter @workflow/world-vercel test (297 tests)
• pnpm --filter @workflow/core test (1,505 passing, 3 expected failures)
• focused changed-file lint: no errors
• autoreview: no accepted findings; one legacy-path finding rejected after verifying that compatibility requests cannot enter the framed response path

[vercel]

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workflow-web	Ready	Preview	Jul 30, 2026 12:02am

[changeset-bot]

🦋 Changeset detected

Latest commit: c11d070

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
@workflow/world-vercel	Patch
@workflow/builders	Patch
@workflow/cli	Patch
@workflow/core	Patch
@workflow/web	Patch
@workflow/astro	Patch
@workflow/nest	Patch
@workflow/next	Patch
@workflow/nitro	Patch
@workflow/nuxt	Patch
@workflow/rollup	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch
@workflow/vitest	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/web-shared	Patch

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[github-actions]

🧪 E2E Test Results

✅ All tests passed

E2E Test Summary

Summary

	Passed	Failed	Skipped	Total
✅ ▲ Vercel Production	1455	0	239	1694
✅ 💻 Local Development	1621	0	227	1848
✅ 📦 Local Production	1621	0	227	1848
✅ 🐘 Local Postgres	1621	0	227	1848
✅ 🪟 Windows	154	0	0	154
✅ 📋 Other	1020	0	212	1232
✅ vercel-multi-region	27	0	0	27
Total	7519	0	1132	8651

Details by Category

✅ ▲ Vercel Production

App	Passed	Failed	Skipped
✅ astro	126	0	28
✅ example	126	0	28
✅ express	126	0	28
✅ fastify	126	0	28
✅ hono	126	0	28
✅ nextjs-turbopack	151	0	3
✅ nextjs-webpack	151	0	3
✅ nitro	126	0	28
✅ nuxt	126	0	28
✅ sveltekit	145	0	9
✅ vite	126	0	28

✅ 💻 Local Development

App	Passed	Failed	Skipped
✅ astro-stable	128	0	26
✅ express-stable	128	0	26
✅ fastify-stable	128	0	26
✅ hono-stable	128	0	26
✅ nextjs-turbopack-canary	135	0	19
✅ nextjs-turbopack-stable	154	0	0
✅ nextjs-webpack-canary	135	0	19
✅ nextjs-webpack-stable	154	0	0
✅ nitro-stable	128	0	26
✅ nuxt-stable	128	0	26
✅ sveltekit-stable	147	0	7
✅ vite-stable	128	0	26

✅ 📦 Local Production

App	Passed	Failed	Skipped
✅ astro-stable	128	0	26
✅ express-stable	128	0	26
✅ fastify-stable	128	0	26
✅ hono-stable	128	0	26
✅ nextjs-turbopack-canary	135	0	19
✅ nextjs-turbopack-stable	154	0	0
✅ nextjs-webpack-canary	135	0	19
✅ nextjs-webpack-stable	154	0	0
✅ nitro-stable	128	0	26
✅ nuxt-stable	128	0	26
✅ sveltekit-stable	147	0	7
✅ vite-stable	128	0	26

✅ 🐘 Local Postgres

App	Passed	Failed	Skipped
✅ astro-stable	128	0	26
✅ express-stable	128	0	26
✅ fastify-stable	128	0	26
✅ hono-stable	128	0	26
✅ nextjs-turbopack-canary	135	0	19
✅ nextjs-turbopack-stable	154	0	0
✅ nextjs-webpack-canary	135	0	19
✅ nextjs-webpack-stable	154	0	0
✅ nitro-stable	128	0	26
✅ nuxt-stable	128	0	26
✅ sveltekit-stable	147	0	7
✅ vite-stable	128	0	26

✅ 🪟 Windows

App	Passed	Failed	Skipped
✅ nextjs-turbopack	154	0	0

✅ 📋 Other

App	Passed	Failed	Skipped
✅ e2e-local-dev-nest-stable	128	0	26
✅ e2e-local-dev-tanstack-start-	128	0	26
✅ e2e-local-postgres-nest-stable	128	0	26
✅ e2e-local-postgres-tanstack-start-	128	0	26
✅ e2e-local-prod-nest-stable	128	0	26
✅ e2e-local-prod-tanstack-start-	128	0	26
✅ e2e-vercel-prod-nest	126	0	28
✅ e2e-vercel-prod-tanstack-start	126	0	28

✅ vercel-multi-region

App	Passed	Failed	Skipped
✅ nextjs-turbopack	27	0	0

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