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Review round: the JSONL backend now refuses a foreign header version straight from the raw header line, before validating today's header shape or decoding any event row, so a structurally different future format reports the upgrade direction instead of corruption (shared message builder sessionFormatVersionRefusal). HMR live-prefix adoption runs the unknown-type guard like the other read paths. The appendCore comment now states why the unknown-type guard is read-side only, the loadStoredFrom JSDoc and README pin the seek-vs-sequential refusal-scope divergence, and the generated catalog preamble lists the ignorable envelope field.