The AuthTicket::renew_after field is only set in init_timestamps() and read by dump() for debugging purposes. It has no functional use cases and causes encoding/decoding inconsistencies.

During decoding, this field remains unchanged, creating discrepancies between original and decoded values. This issue was masked because check-generated.sh and readable.sh reused struct instances, preserving stale field values across encode/decode cycles.

An upcoming change will allocate fresh instances for each decode operation, which would expose these inconsistent values.

Remove the unused field to eliminate the encoding inconsistency and simplify the codebase.

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