Increase cleanupPeriodDays for /resume

Claude Code keeps local session history for a limited cleanup period. Increasing this makes /resume more useful.

Recommended setting

{
  "cleanupPeriodDays": 365
}

For very long retention:

{
  "cleanupPeriodDays": 99999
}

/resume lets you continue previous coding sessions. If old sessions have been cleaned up, they no longer appear in /resume.

Claude Code becomes more useful when you preserve context.