chore(acp): sync agent runtime version pins

[szysammie]

Summary

• Sync the runtime install commands for eight ACP agents with benchflow-ai/benchflow#946.
• Pin the upgraded Claude, Codex, Gemini, Pi, MiMo, OpenClaw, and OpenCode package versions.
• Raise the shared Node.js runtime pin to the version required by the pinned OpenClaw release.
• Remove Corust Agent’s invalid acp_model_format = "prefixed"; model selection is disabled for that vendor-controlled agent, so the field was unused.

Why

BenchFlow currently keeps a compatibility copy of manifest-owned agent data in its core registry. Its manifest-parity workflow compares that registry with benchflow-ai/agents@main, so the package upgrades in benchflow-ai/benchflow#946 require the corresponding manifest updates here.

The full contract suite also exposed a pre-existing Corust manifest/schema mismatch. Removing the unused invalid value restores repository-wide contract validation without changing Corust runtime behavior.

Companion to benchflow-ai/benchflow#946.
Related to benchflow-ai/benchflow#945.

Validation

• Agents contract suite: 21 passed.
• BenchFlow live manifest parity: 12 passed.

[szysammie]

Could a maintainer please approve the workflow runs for this PR?

If the checks pass, please merge it when convenient. This companion manifest update is required to unblock the manifest-parity check in benchflow-ai/benchflow#946. After this PR lands on agents/main, please also re-run the checks on benchflow-ai/benchflow#946 so it can validate against the updated manifests. Thank you!