feat(polymarket): return published evidence digests

[proerror77]

Change contract: Return the exact published NDJSON and manifest SHA-256 digests as a publication-only carrier after the immutable evidence triplet is installed.

Out of scope: Constructing the verifier-side PolymarketEvidenceTrustAnchor; authenticating an OSS object or catalog selection; changing triplet bytes, publication ordering, or no-clobber behavior; snapshot compilation or research consumption.

Dependency or merge order: None. The carrier is deliberately named PublishedPolymarketEvidenceDigests and requires an explicit downstream conversion into the separately typed verifier trust anchor.

Focused validation:

• cargo test --locked -p hft-collector polymarket_evidence_artifact
• cargo clippy --locked -p hft-collector --all-targets --no-deps -- -D warnings
• rustfmt --edition 2021 --check rust_hft/tools/collector/src/polymarket_evidence_artifact.rs
• git diff --check
• Linux-only counterexample/identity test: published_result_returns_digests_for_the_exact_triplet recomputes the manifest digest from the exact installed bytes.

Rollout/rollback impact: Additive publisher JSON output only; artifact data, manifest, _SUCCESS, and publication safety behavior are unchanged. Rollback removes the returned digest carrier without invalidating already-published triplets.

Scope exception: None (1 file, 82 added lines).

Summary by CodeRabbit

• New Features
  • Published evidence results now include expected SHA-256 digests for both normalized content and the associated manifest.
  • Added validation to confirm these digests match the exact published evidence and stored manifest bytes.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3bea1031-b169-4900-83f3-4687acecf0c2

📥 Commits

Reviewing files that changed from the base of the PR and between 370dbe4 and 64db3e7.

📒 Files selected for processing (1)

• rust_hft/tools/collector/src/polymarket_evidence_artifact.rs

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📝 Walkthrough

Walkthrough

PublishedPolymarketEvidence now returns expected content and manifest SHA-256 digests. Publication computes the manifest digest from serialized bytes, and a Linux-only test verifies both returned digests against the normalized evidence and written manifest.

Changes

Published evidence digest reporting

Layer / File(s)	Summary
Digest contract and publication rust_hft/tools/collector/src/polymarket_evidence_artifact.rs	Adds PublishedPolymarketEvidenceDigests, extends PublishedPolymarketEvidence, computes the manifest SHA-256, and returns both expected digests.
Digest validation test rust_hft/tools/collector/src/polymarket_evidence_artifact.rs	Adds validation imports and a Linux-only test covering content and on-disk manifest digest matching.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related PRs

• proerror77/monday#98: Introduces the Polymarket evidence publishing API and PublishedPolymarketEvidence extended by this change.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: returning published evidence digests.
Description check	✅ Passed	The description covers the required template sections and includes contract, scope, validation, rollback, and exception details.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/polymarket-publisher-trust-anchor

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