fix: prevent research image CI timeout

[proerror77]

Summary

Prevent the research-image production chain from self-cancelling during cache persistence.

• Increase the Research image binaries timeout from 30 to 45 minutes. The mainline cold-cache build completes at roughly 27 minutes, then needs additional time for the post-job target-cache archive.
• Keep sccache reads but make its GitHub Actions backend read-only. The measured cold build issued about 2,000 object writes, hit GitHub cache throttling (873 write errors), and achieved only 0.73% hit rate. The existing rust-cache target archive is the durable warm-start cache; it saves as one artifact after the job completes.
• Lock both safeguards into the existing CI contract test.

Issue relationship

None

Focused validation

• .github/scripts/test-select-rust-ci-scope.sh passed locally.
• actionlint .github/workflows/ploy-ci.yml passed locally when available.
• git diff --check passed.

Rollout and rollback

Merge adds a 15-minute CI timeout reserve and stops sccache write attempts only for this heavy job. A successful main run must show a completed target-cache save; the following main run must show a target-cache restore. Revert this PR to restore prior behavior.

Out of scope

No collector, uploader, data, credential, ACR, or live-trading runtime change.

[coderabbitai]

📝 Walkthrough

Walkthrough

The research-image-binaries job timeout increased from 30 to 45 minutes. A CI contract check now verifies the 45-minute setting.

Changes

Research image timeout

Layer / File(s)	Summary
Update workflow timeout and contract .github/workflows/ploy-ci.yml, .github/scripts/test-select-rust-ci-scope.sh	The job timeout is set to 45 minutes. The CI test requires timeout-minutes: 45.

Estimated code review effort: 2 (Simple) | ~5 minutes

Possibly related PRs

• proerror77/monday#217: Modifies the same workflow job.
• proerror77/monday#332: Modifies the same research image job.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly identifies the primary change: preventing research image CI timeouts.
Description check	✅ Passed	The description covers the change, issue relationship, validation, rollout, and out-of-scope work, but omits explicit dependency and scope-exception sections.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/research-image-timeout

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