[BUG] Durable cron tasks written to ephemeral git worktree instead of main repo

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Persisted scheduled tasks created when Claude is running in a non-main worktree are lost when working in other worktrees, or if the worktree is deleted.

What Should Happen?

Persisted scheduled tasks should be available in all worktrees for a given repo.

Error Messages/Logs

Steps to Reproduce

• CronCreate with durable: true writes scheduled_tasks.json to .claude/ in the current working directory
• When CWD is a git worktree, the file is lost when the worktree is cleaned up
• Should write to the main worktree's .claude/ (discoverable via git rev-parse --git-common-dir) or ~/.claude/
• Reproducible: create worktree, start Claude, create durable cron, remove worktree, task is gone

Claude Model

None

Is this a regression?

Untested.

Last Working Version

None.

Claude Code Version

2.1.119 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

_No response_