[docs] Fill gaps in the dynamic workflows concept page

[alangenfeld]

Summary & Motivation

Fills gaps the 5.0.0 dogfood surfaced on the dynamic workflows concept page: a table of the per-gate refusals and which of them are fatal, how a Vercel project gets dynamic-source storage, what the 2,048-byte execution-context budget actually buys, that the workflow ID hashes raw source bytes, and that "trusted" means reviewed application code rather than anything a model did not write.

Stacked on #4541, which adds the cookbook recipe this page now links to.

Test Plan

Docs only. Links, anchors, quoted error messages, and the fatal/retryable behavior were checked by hand against the runtime source on main.

#4534 (open) edits this page's exportName rule. This PR leaves that line alone, quotes only the stable prefix of the execution-context error that #4534 extends, and does not document #4534's validation messages.

Docs Preview

Page	Link
Dynamic workflows	/docs/advanced/dynamic-workflows
Errors for each gate	#errors-for-each-gate
Enabling storage on Vercel	#enabling-storage-on-vercel

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated
example-nextjs-workflow-turbopack	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
example-nextjs-workflow-webpack	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
example-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-astro-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-express-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-fastify-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-hono-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-nestjs-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-nitro-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-nuxt-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-python-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-sveltekit-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-tanstack-start-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workbench-vite-workflow	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workflow-docs	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workflow-swc-playground	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workflow-tarballs	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC
workflow-web	Ready	Preview, v0	Oct 1, 2026 9:16pm UTC

[changeset-bot]

🦋 Changeset detected

Latest commit: 33e7dc3

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

This PR includes changesets to release 0 packages

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

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[github-actions]

Sim World

Simulated world deterministic testing for races. Traces

🟠 world-sim scenario book — 1 fail of 42 total

fence=per-spec

scenario	outcome	events	virt	replay	violations
✅ smoke-no-steps	completed	3	0ms	ok	0
✅ smoke-one-step	completed	6	0ms	ok	0
✅ hook-at-step-started	completed	12	0ms	ok	0
✅ hook-at-step-completed	completed	12	0ms	ok	0
✅ hook-at-hook-created	completed	12	0ms	ok	0
✅ deadline-hook-wins	completed	7	1.0h	ok	0
✅ deadline-expires	completed	7	1.0h	ok	0
✅ step-vs-timer-early-settlement	completed	8	1.0h	ok	0
✅ long-sleep	completed	11	30.0d	ok	0
✅ hook-never-arrives	stalled	3	0ms	skipped	0
✅ step-retries-twice	completed	10	2.0s	ok	0
✅ parallel-steps	completed	9	0ms	ok	0
✅ hook-on-execution-state	completed	12	0ms	ok	0
✅ peek-hook-before-branch	completed	12	0ms	ok	0
✅ peek-hook-after-branch	completed	12	0ms	ok	0
✅ peek-hook-at-registration	completed	12	0ms	ok	0
✅ race-hook-before-probe	completed	12	0ms	ok	0
✅ race-hook-after-probe	completed	12	0ms	ok	0
✅ race-duplicate-delivery	completed	13	0ms	ok	0
✅ attr-hook-before-step	completed	11	0ms	ok	0
✅ attr-hook-after-step	completed	11	0ms	ok	0
✅ attr-from-step-body	completed	13	0ms	ok	0
✅ fork-hook-after-timeout	completed	14	1.0m	ok	0
✅ fork-hook-before-timeout	completed	14	1.0m	ok	0
✅ count-hook-after-timeout	completed	17	1.0m	ok	0
✅ count-hook-before-timeout	completed	20	1.0m	ok	0
✅ stale-read-step-count-fork	completed	20	1.0m	ok	0
✅ stale-read-equal-step-counts	completed	14	1.0m	ok	0
✅ step-vs-step-fork	completed	12	0ms	ok	0
✅ step-vs-step-fork-fenced	completed	12	0ms	ok	0
✅ fence-catches-benign-direction	completed	12	5ms	ok	0
✅ in-flight-before-decision	completed	17	1.0m	ok	0
❌ in-flight-before-decision-counted	completed	17	1.0m	ok	0
✅ in-flight-after-decision	completed	19	2.0m	ok	0
✅ stale-read-step-count-fork-fenced	completed	20	1.0m	ok	0
✅ fork-hook-wins	completed	13	1.0m	ok	0
✅ fork-timeout-wins	completed	13	1.0m	ok	0
✅ unclaimed-payload-under-fork	completed	17	1.0m	ok	0
✅ claimed-payload-under-fork	completed	17	1.0m	ok	0
✅ writers-independent-step-bodies	completed	12	0ms	ok	0
✅ writers-scripted-tempo	completed	12	0ms	ok	0
✅ cancel-mid-step	cancelled	7	0ms	skipped	0

Full trace: world-sim.txt

[vercel]

Additional Suggestion:

A generated TypeScript incremental build cache (workbench/example/tsconfig.tsbuildinfo) was accidentally committed as a tracked file and is not git-ignored.