Record Depot registry canary results

[ndizazzo]

Summary

• record all seven valid five-versus-five registry cohorts
• retain exact digests and workflow run evidence
• document that no mapping met the gate and both rollout variables remain disabled

Validation

• git diff --check

Summary by CodeRabbit

• Documentation
  • Added initial measurement results for registry image pull-through performance.
  • Results cover seven images tested across five fresh runners per source, including digest verification.
  • No tested image met the adoption threshold.
  • Cache readiness checks remain unmet.
  • Alpine results are not included, and runs affected by authentication failures were excluded.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ab6b0e92-fd07-43fc-b8d3-39f0fdff0ab9

📥 Commits

Reviewing files that changed from the base of the PR and between 30fa060 and b205629.

📒 Files selected for processing (1)

• ci/METRICS.md

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📝 Walkthrough

Walkthrough

The change documents seven Depot Registry pull-through measurement cohorts. It records median results, gate outcomes, cache status, and excluded Alpine and authentication-failure runs.

Changes

Depot Registry measurements

Layer / File(s)	Summary
Measurement results and gate status ci/METRICS.md	Documents seven valid cohorts with upstream and Depot medians, relative results, run links, failed adoption gates, false cache gates, and excluded runs.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• Mesh-LLM/mesh-llm#1156: Introduces the canary whose results are documented here.
• Mesh-LLM/mesh-llm#1157: Updates the five-runner comparison and OIDC authentication setup used by the measurements.
• Mesh-LLM/mesh-llm#1158: Updates the measurement procedure and fresh-runner methodology.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the PR's main change: recording Depot registry canary results.
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 unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/record-depot-registry-canaries

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