test(core): cover cancel run spec version

[EfeDurmaz16]

Description

Adds regression coverage for cancelRun() so Vercel-backed cancellation keeps sending a run_cancelled event with the target run's specVersion. This protects the issue #1076 path where the Vercel backend rejected cancellation payloads that were missing versioned event fields.

Also covers the legacy fallback path to ensure runs without a stored spec version still use the v1-compatible cancellation endpoint.

While refreshing the PR, I also fixed the Local Postgres E2E setup race visible in recent CI runs. Multiple matrix jobs were starting Graphile migrations concurrently and failing with duplicate Postgres schema / migration rows, so the Postgres queue startup now serializes Graphile migration work behind a Postgres advisory lock held on a single client.

Closes #1076.

How did you test your changes?

• corepack pnpm exec vitest run packages/core/src/runtime/runs.test.ts
• corepack pnpm exec biome check packages/core/src/runtime/runs.test.ts
• corepack pnpm --filter @workflow/core typecheck
• corepack pnpm exec vitest run packages/world-postgres/src/queue.test.ts
• corepack pnpm exec biome check packages/world-postgres/src/queue.ts packages/world-postgres/src/queue.test.ts
• corepack pnpm --filter @workflow/world-postgres typecheck

Note: corepack pnpm turbo run build --filter='!./workbench/*' was blocked locally by a missing Rust wasm32-unknown-unknown target in @workflow/swc-plugin; the targeted Postgres and core checks above pass locally.

PR Checklist - Required to merge

• 📦 pnpm changeset was run to create a changelog for this PR
  • Used pnpm changeset --empty because the original change is test-only.
• 🔒 DCO sign-off passes (run git commit --signoff on your commits)
• 📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete

[changeset-bot]

🦋 Changeset detected

Latest commit: befdf1e

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

This PR includes changesets to release 17 packages

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

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[vercel]

@EfeDurmaz16 is attempting to deploy a commit to the Vercel Labs Team on Vercel.

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[VaguelySerious]

The changes to graphile workers in postgres have been fixed separately and should no longer be necessary

[EfeDurmaz16]

Thanks for the review. I dropped the world-postgres / Graphile migration changes from this PR so it is back to the focused core cancel-run specVersion coverage.

Verification:

• pnpm --filter @workflow/core... build
• pnpm exec vitest run packages/core/src/runtime/runs.test.ts
• git diff --check

Note: the broader pnpm --filter @workflow/core test -- src/runtime/runs.test.ts form also ran unrelated core tests and hit local environment issues under Node v26 / unbuilt workspace entries, so I used the direct targeted Vitest command after building the core dependency graph.