fix(runtime): retain partial readiness evidence

[seonghobae]

Summary

• advance the immutable contextual-orchestrator pin to PR feat(reports): leftover expected on grouping comparison graphic (v2.74.0) #857 exact 3558a9a3aeb985282b255fcd80bb2201c19ae54b
• verify and commit the matching upstream archive SHA-256
• record that one candidate probe failure cannot discard successful readiness evidence from other candidates

Validation

• focused revision, documentation, Compose, and startup contracts: 22 passed
• canonical Compose config validated quietly with MCP profile
• upstream focused readiness/HTTP/structured contracts: 106 passed

Stacked on #786 after #789.

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[devin-ai-integration]

Devin Review found 1 potential issue.

[devin-ai-integration]

🔍 Archive checksum unverifiable in-repo

The ADD --checksum sha256 was updated to 8dcd15b0... for the new pinned commit. This is the one value the PR cannot self-verify; if it does not match the real archive bytes the build fails closed at fetch time.

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