Remove the legacy Ant OpenHands runner

docs/simulation-heuristics-ant-v1-task-design.md

@@ -199,8 +199,8 @@ GENESISBENCH_RUN_SLOW_ANT_MPC=1 \
 - The agent container receives the public task but not `verifier/`.
 - The agent receives only a copied model path for optional MPC, never the live
   scored environment.
-- Credentials are supplied through a temporary mode-`0600` file and removed
-  after agent startup.
+- Provider credentials are scoped to the selected model route and are not
+  copied into the public task workspace or committed artifacts.
 - Final scores come from the independently imported final policy.
 - Invalid actions receive a fixed failure result instead of crashing scoring.
 - Public packaged score files contain only relative paths.
@@ -213,7 +213,7 @@ Simulation Heuristics Ant v1 demonstrates the full GenesisBench task lifecycle:
 ```text
 task scaffold
 → public workspace preparation
-→ autonomous OpenHands run
+→ autonomous BenchFlow/OpenCode run
 → clean final evaluation
 → packaged submission
 → audited leaderboard

leaderboard/README.md

@@ -11,6 +11,10 @@ nine task-specific rankings followed by the final IQM ranking.
 
 ![GenesisBench Simulation Heuristics Ant v1 leaderboard](simulation_heuristics_ant_v1_leaderboard.png)
 
+This is an immutable historical OpenHands result. The retired runner is no
+longer shipped in the current tree; see [`REPORT.md`](REPORT.md) for provenance
+and the Git-history source pointer.
+
 | Rank | Agent model | Harness | Reasoning | Score | Normalized | Nominal | Robust | Fall rate |
 | ---: | --- | --- | --- | ---: | ---: | ---: | ---: | ---: |
 | 1 | GPT-5.6 Sol | OpenHands SDK | xhigh | 3417.86 | 150.24 | 3399.54 | 3460.62 | 0.0% |

leaderboard/REPORT.md

@@ -56,7 +56,7 @@ surviving for more steps.
 - Machine-readable leaderboard: `leaderboard/simulation_heuristics_ant_v1.json`
 - Packaged policies and scores: `leaderboard/submissions/`
 - Deterministic verifier: `tasks/simulation_heuristics_ant_v1/verifier/evaluate_hidden.py`
-- Run and audit commands: `experiments/simulation_heuristics_ant_v1/README.md`
+- Artifact audit: `scripts/audit_simulation_heuristics_ant_v1_leaderboard.py`
 
 Every packaged policy was re-evaluated after packaging, and all four scores
 matched their recorded score exactly.
@@ -65,6 +65,11 @@ Raw OpenHands trajectories are intentionally excluded from the source
 distribution because they are large and can contain provider-specific runtime
 metadata. Packaged metadata retains a non-secret source run identifier.
 
+The executable OpenHands runner was retired after the nine-task OpenCode suite
+became canonical. Its final source snapshot remains available in Git history at
+commit `8f05ed4`; the current tree retains only the immutable published
+artifacts, verifier, audit, and this methodology report.
+
 ## Limitations
 
 - This is one agent run per model, not a multi-trial estimate of model quality.