Keep stage/reason classification in the Journal Feature without changing frozen input, metadata or fallback behavior. Exercise connection, Host read failures, size budget and secret-bearing fixtures through compaction persistence.
Validation: old freeze function with new tests fails connection and snapshot/size diagnostics (3 failures); new code passes all six selected cases and cargo test -p worker. Serialization is currently unreachable for the derived JSON-safe snapshot fields; no artificial runtime failure is claimed.
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