Harden AWF downloads and digest-pinned MCP startup

[Copilot]

Transient release-download failures could abort evals, while MCP Gateway rejected valid digest-pinned container images. Missing evals artifacts then produced misleading downstream errors.

• AWF installation

  • Centralize release downloads behind retry/backoff handling.
  • Report an explicit network error when retries are exhausted.

• MCP Gateway

  • Accept image[:tag]@sha256:<64-hex> container references.
  • Keep runtime and published schemas synchronized.

• Evals reporting

  • Continue when the upstream evals artifact is absent.
  • Emit a clear notice that evals were skipped or failed upstream.

• Fixes [aw-failures] [P1] Two new job-failure root causes: AWF binary curl reset in Daily SPDD evals + MCP Gateway serena digest-pin sc [Content truncated due to length] #53191

[github-actions]

Hey 👋 — thanks for tackling this infrastructure reliability issue! The PR is well-anchored to issue #53191 with clear success criteria. Here are a few things to clarify as you move forward:

• Scope clarity — Issue [aw-failures] [P1] Two new job-failure root causes: AWF binary curl reset in Daily SPDD evals + MCP Gateway serena digest-pin sc [Content truncated due to length] #53191 describes two separate fixes: (1) shell script retry logic for curl, and (2) MCP Gateway schema validation for digest-pinned images. Your PR title focuses on the first. Please clarify in the PR body whether you're addressing both in this single PR or splitting them.
• Add tests — Once you implement the retry logic, add shell script tests (or update existing install_awf_binary.sh test coverage) to verify the retry behavior under simulated transient failures.
• Targeted tests and manual verification — Your checklist mentions "Run targeted tests and manual verification" as a task — make sure those are completed and their results documented before marking this ready for review.

The plan looks solid. Looking forward to seeing the implementation!

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