Per-activation context the evaluator exposes via
Hourglass.Workflow.info/0.
Built lazily from the active Hourglass.Workflow.State (set in
the evaluator's process dict by mark_evaluator_active/1) when a
workflow body calls Workflow.info/0. Cleared by the evaluator's
unmark_evaluator/0 on exit, regardless of completion shape.
The task_queue is the queue the workflow itself is running on. The
v3 source-ingest workflow threads this through to the
parse_and_emit_source / chunk_and_emit_markdown_bytes activities
so that the :workflow_start outbox entries those activities append
for child workflows carry the same queue, keeping all
per-source per-chunk workflows on the same worker.