fix(dispatcher): Verify project runner archive attestation before extraction

[hatayama]

Summary

The dispatcher project-runner download flow now requires a valid Sigstore attestation for each downloaded uloop-project-runner-*.tar.gz / uloop-project-runner-*.zip archive before it will extract and cache the runner binary.

This is Phase B3 of TODO 2 (docs/plans/). Phase B1 (PR #1670) added the verifier package; Phase B2 (PR #1671) wired the installer path. This PR reuses the shared verifier hook and identity constants from B2 with attestationRunnerPublishWorkflowPath.

User Impact

Before: A compromised GitHub releases origin could serve a malicious uloop-project-runner-*.tar.gz + matching .sha256, and the dispatcher would happily extract and execute it — sha256 alone cannot prove authenticity when the checksum ships from the same origin as the archive.

After: The runner archive will not be extracted unless its .sigstore.json bundle cryptographically verifies against Sigstore's public-good trust anchor, the workflow identity matches .github/workflows/native-cli-publish.yml on an allowed ref (refs/heads/v3-beta or refs/heads/main), and the release tag's commit SHA matches the certificate's Source Repository Digest extension (OID 1.3.6.1.4.1.57264.1.13). Fail-closed on bundle-missing, network-failure, digest-mismatch, and identity-mismatch.

Changes

• downloadDispatcherRealCLIForPin now calls verifyReleaseAssetAttestation with attestationRunnerPublishWorkflowPath after the sha256 check succeeds but before the archive is extracted.
• Existing TestDownloadDispatcherRealCLIWritesDownloadStatus stubs the attestation hook (unchanged behavior).
• Two new tests cover the runner integration: fail-closed on attestation error, and the exact uloop-project-runner-v<version> release tag + native-cli-publish.yml workflow path forwarded to the hook.

Verification

• scripts/check-go-cli.sh — 0 lint issues across all Go modules
• go test ./... in cli/dispatcher/ — all packages pass

Follow-up

Phase B4 (dispatcher self-update archive verification via ULOOP_EXPECTED_ARCHIVE_SHA256 from a verified in-toto statement) remains — see Obsidian spec line 68-71. The self-update path in update.go only attests the installer script; the archive that install.sh downloads is still same-origin-sha256-only, so TODO 2's acceptance criterion is not yet met on the self-update path. Runner downloads (this PR) do not have that gap because the dispatcher extracts the archive directly in Go.

Refs: docs/plans/ spec, TODO 2 Phase B3

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Review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 109bc9f and 2b25b89.

📒 Files selected for processing (2)

• cli/dispatcher/internal/dispatcher/dispatcher_download.go
• cli/dispatcher/internal/dispatcher/dispatcher_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/attestation-integrate-runner

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