Give developers one pnpm command to exercise the release migration against their own Session roots. Inventory physical generations so malformed entries remain visible, then reuse JSONL write-open locking, validation, and exclusive successor publication with the full root available for child-catalog evidence. Open existing V4 files read-only and preserve every historical generation.
Report each selected source and outcome, continue after individual failures, repeat all errors at the end, and retain a private temporary report with checkout/runtime details and full causes. A failed run exits nonzero. Explicitly close handles because source-launch await-using lowering inside a loop can retain a previous iteration error. Real-entry regressions cover raw/zstd tool-result conversion, repeated runs, unchanged originals, failure continuation, and unsupported layouts. Document the command in the migration cookbook.
Tianyi Cui
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