tractor/ai/prompt-io/prompts/issue_485.md

attempt to resolve (PR A of) https://github.com/goodboy/tractor/issues/485 do it with /open-wkt (suggested wkt name: taskman_485).

REQUIRED READING before writing any code,

• the full design + impl plan (self-contained hand-off doc): ai/conc-anal/to_actor_taskman_design.md
  • it resolves the open design items, carries the hilevel_serman rebase/convergence map (incl. the known portal.wait_for_result() breakage at _service.py:292) and defines the PR A/B/C sequencing — follow it.
• the issue body (the contract + task list): #485
• prior art to derive from,
  • branch hilevel_serman (tip 93d161bf): the tractor/hilevel/_service.py ServiceMngr port — rebase it first per the doc.
  • PR #363 (oco_supervisor_prototype): the trionics taskman prototype.
  • ria_nursery_removal_plan.md (same dir as the design doc) for the #477 background + the open_one_shot() sketch this generalizes.

house rules (also see the repo/global CLAUDE.md + skills),

• NEVER git commit/push without an explicit human ack in the moment; per-file/-group commits for bisectability, with a failing test landing BEFORE its fix (red -> green).
• gate per-commit: module tests on trio + mp_spawn spot-gates, ALWAYS incl. tests/test_infected_asyncio.py for spawn/supervise-touching changes; full suite green before PR (UV_PROJECT_ENVIRONMENT=py313 uv run pytest).
• all ActorNursery bindings are named an:; trio nursery bindings tn:.
• log prompt-io per the NLNet policy (/prompt-io skill) and update the design doc’s outcome as you land steps.