ci(actions): scope Product cancellation to PR heads

[seonghobae]

Summary

• key Product CI concurrency by workflow, repository, and pull request
• isolate non-PR runs by run ID and cancel only pull-request supersessions
• strengthen the existing CI contract against ref-based non-PR grouping

Scope

Workflow and existing CI contract only. No ontology or domain code changes.

Verification

• actionlint .github/workflows/product.yml
• python3 scripts/check_ci_contract.py
• git diff --check

Stacked on #1 because product.yml is introduced there and does not exist on main yet.

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[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T14:53:32.704245Z	ecb1218	PR opened

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