ci: keep Prediction Markets main runs alive

[proerror77]

Change contract

Prediction Markets CI keeps every main push run alive while still cancelling superseded runs on PR and other non-main refs.

Issue relationship

Closes #616

Out of scope

• Monorepo CI concurrency
• Cache keys or sccache behavior
• Aliyun scope routing
• ACR publication or deployment

Dependencies and merge order

Merge before #613 resumes because both contracts touch ploy-ci.yml and its focused contract test.

Focused validation

• bash .github/scripts/test-select-rust-ci-scope.sh — passed
• bash -n .github/scripts/test-select-rust-ci-scope.sh — passed
• shellcheck --severity=error .github/scripts/test-select-rust-ci-scope.sh — passed
• Ruby YAML parse of .github/workflows/ploy-ci.yml — passed
• git diff --check origin/main...HEAD — passed
• Counterexample: the exact-expression assertion failed against the previous cancel-in-progress: true value before the workflow change.

Rollout and rollback

CI scheduling only. Revert this PR to restore cancellation for superseded main Prediction Markets CI runs.

Scope exception

None.

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Review details

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Run ID: dbc06312-8d5b-412b-ac5e-49a22f57f0d4

📥 Commits

Reviewing files that changed from the base of the PR and between 20ca2a1 and 370c1d7.

📒 Files selected for processing (2)

• .github/scripts/test-select-rust-ci-scope.sh
• .github/workflows/ploy-ci.yml

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