docs: make technical prose concrete

packages/workflow/workflow-workerthread/src/runtime.ts

@@ -1,5 +1,5 @@
 /**
- * Per-run worker-side vm hooks, child RPC, concurrency/caps, cancellation, and result shaping; it
+ * Per-run worker-side vm hooks, child RPC, concurrency/caps, cancellation, and result serialization; it
  * never touches Cordis. Script values leaving the realm are materialized as plain JSON before
  * messaging. Values entering the trusted model-written realm are passed directly; `args` alone is
  * cloned so script mutation cannot alter initialization data. See `./realm.ts` for the trust model.