ci(release): accept squash release titles

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Summary

• accept GitHub squash-merge release titles with a trailing PR suffix
• keep immutable release image tags tied to real release commits

Validation

• trunk check --show-existing --all
• python3 scripts/validate-template.py
• pytest tests/unit tests/template
• pytest tests/integration -m integration
• /tmp/trunk-analytics-cli/trunk-analytics-cli validate --junit-paths "reports/pytest-unit.xml,reports/pytest-integration.xml"
• git diff --check