feat: expose custom_metadata_checksum and ConcurrencyConflictError for optimistic concurrency control [PYSDK-130]#632

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feat/expose-custom-metadata-checksum-param

Commits on Jun 16, 2026

feat: expose custom_metadata_checksum on update_custom_metadata and update_item_custom_metadata
akunft
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fix: address Copilot review comments on checksum-param PR
akunft
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fix: resolve SonarCloud S1192 duplicate string literal warnings
akunft
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refactor(test): use public API imports in service_test.py
akunft
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fix: resolve SonarCloud S1192 duplicate string literal in runs.py
akunft
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refactor: move ConcurrencyConflictError to platform, fix cast style, exit code 3, GUI handler
akunft
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fix: address code-review findings from checksum-param PR
akunft
committed