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Old runtimes meeting a newer session format now fail loud instead of misreading: version refusal names the direction (newer: upgrade the harness; older: no upgrade path) and points at the raw JSONL log, and an event type outside the generated known vocabulary refuses resume unless its envelope carries the new ignorable: true marker (default: required, so a forgotten marker over-refuses instead of silently resuming a gutted session). gen-persistence-catalog now also emits KNOWN_SESSION_EVENT_TYPES; SQLite stores the marker in a dedicated column (SCHEMA_VERSION 15). The versioning design (monotonic integer, n->n+1 upgrader chain, migrate-on-continue) is recorded in the session-log-version-mechanism Agent Note.