fix(v1): pin Prime Agent v0.8.1

[sethkarten]

Summary

• replace the Prime Agent beta pin with stable v0.8.1
• pin the release merge commit and published checksums
• keep the existing install and cache flow unchanged

This is the short-term stable pin. Draft #2444 will handle automatic stable resolution separately.

Release evidence

• release: https://github.com/PrimeIntellect-ai/prime-agent/releases/tag/v0.8.1
• commit: 514633727bf26d74f39f3119c2b0e31a5ceb2a9d
• all four GitHub and R2 tarballs match the published SHA256SUMS

Validation

• uv run --frozen ruff format --check .
• uv run --frozen ruff check .
• uv run --frozen ty check verifiers/v1/harnesses/prime_agent/harness.py
• uv run --frozen pytest tests/v1 -q
• temporary installer wiring check
• git diff --check

No paid evaluation was run. The credentialed GitHub V1 live E2E workflow must remain canceled for this PR.

---

Note

Low Risk
Dependency pin and installer URL/checksum updates only; no harness runtime or ACP behavior changes.

Overview
Updates the Prime Agent harness to install stable v0.8.1 instead of the previous beta pin.

The pinned merge commit, PrimeAgentHarnessConfig literal type, release version string, and installer SHA256 checksums for all four tarballs are refreshed. The install script now pulls from the v0.8.1 GitHub release path (.../v$PRIME_AGENT_RELEASE_VERSION) rather than the beta channel; download, verify, repack, and global npm install behavior is unchanged.

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — The PR changes the runtime Prime Agent dependency, release channel, cache key, and artifact checksums. An unresolved review comment identifies a possible mismatch between the pinned source commit and the stable v0.8.1 artifacts, requiring human verification.

Not approved because:

• Monthly spending limit reached (workspace setting). Approvability relies on correctness review in order to determine eligibility

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