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When a release is created or updated with attachments, automatically compute SHA256 checksums for every file and attach a checksums.sha256 manifest file. The manifest follows the standard sha256sum format: <hash> <filename> Existing checksums.sha256 files are replaced when attachments change. Checksums are generated for both CreateRelease and UpdateRelease flows. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>