vercel__workflow/.changeset/pre/lazy-hook-resumption.md

workflow, @workflow/core, @workflow/world, @workflow/world-vercel, @workflow/world-local, @workflow/web-shared, @workflow/world-postgres

workflow	@workflow/core	@workflow/world	@workflow/world-vercel	@workflow/world-local	@workflow/web-shared	@workflow/world-postgres
minor	minor	minor	minor	minor	patch	patch

Lazy hook resumption: on a fast path, resumeHook() writes the hook_received event and dispatches the workflow queue message concurrently instead of sequentially, cutting a round trip off resume latency. A (runId, resumeId) dedup constraint keeps the two writers converging on exactly one event; the runtime falls back to the sequential path when dedup support is unavailable or when WORKFLOW_DISABLE_LAZY_HOOK_RESUME=1. resumeHook() resolves to a ResumedHook (a Hook plus an optional resilientResume: true flag, set only when the direct write failed transiently and the resume was recovered via the queue consumer's re-ensure) — preserving the contract introduced alongside the resilient-resume work.