HOMEGOLF-16: Unblock detached artifact scoring and score-closeout receipts on the local HOMEGOLF lane

[AtlantisPleb]

Summary

Close the detached artifact-scoring blocker on the local HOMEGOLF lane so artifact-only training runs actually terminate with retained score receipts.

Tracking issue: #633

Why

Current retained local runs show the training side is no longer the only blocker:

• 20260328f, 20260328k, and 20260328l all wrote training_report.json
• prompt closeout also completed on those runs
• artifact_score_report.json still did not land
• each run still had a live artifact_score_closeout.pid during the latest audit sample

So the current local loop can train and export, but it still cannot close the score path honestly.

Scope

• debug the detached scorer runtime and watcher contract on the local HOMEGOLF lane
• determine whether the blocker is score runtime throughput, process lifecycle, stale polling, file-contract drift, or another Rust-side bug
• make successful score closeout emit deterministic artifact_score_report.json and artifact_score_summary.json
• make failed score closeout terminate with a typed retained failure instead of an indefinitely alive watcher pid
• keep the top-level run summary machine-legible about score-closeout state

Acceptance Criteria

• one fresh artifact-only HOMEGOLF run produces all of:
  • training_report.json
  • prompt_report.json
  • artifact_score_report.json
  • artifact_score_summary.json
• the detached scorer exits cleanly instead of staying alive indefinitely
• failure paths are retained as typed score-closeout refusals, not silent stalls
• docs and operator scripts are updated to reflect the real score-closeout contract

References

• docs/2026-03-28-homegolf-xtrain-pgolf-detached-artifact-score-closeout-audit.md
• docs/2026-03-28-parameter-golf-winner-gap-and-psionic-path-audit.md

[AtlantisPleb]

This March 28 detached-score-closeout issue is no longer the right active tracker.

What landed after this issue was opened:

• crates/psionic-train/src/bin/parameter_golf_homegolf_artifact_score.rs
• scripts/wait-parameter-golf-homegolf-artifact-score.sh
• scripts/run-parameter-golf-homegolf-local-cuda.sh --attach-detached-score-closeout
• the canonical lane writeup in docs/HOMEGOLF_TRACK.md

What is still true:

• HOMEGOLF remains a valid proving lane under the broader Psion program
• full HOMEGOLF score-improvement closure is not the repo's current critical path
• we should not keep this older tactical issue open in parallel with the newer lane docs and the current PSION-* execution stack

If detached score closeout becomes the active blocker again, reopen it as a fresh narrower HOMEGOLF runner issue against the current lane contract instead of carrying this pre-roadmap tactical bucket forward.

Closing as superseded / not planned.