File History Persistence Across Sessions

What: File backup snapshots are now persisted to session logs and restored when resuming previous sessions, preserving the complete file modification history across Claude Code restarts.

How it works:

• During execution, file history snapshots are automatically saved to the session log file
• When resuming a session (e.g., claude --resume <session-id>), backup files from the previous session are hard-linked or copied to the new session directory
• The file history UI state is fully restored, showing which files were tracked and their modification history

Details:

• Session log entries now include a new type: "file-history-snapshot" at insertFileHistorySnapshot() at line 438449
• New function a_1() at line 384641 handles cross-session backup file migration
• New function t11() at line 384611 generates session-specific backup file paths
• New function n_1() at line 384636 processes snapshots to extract tracked files for UI restoration
• Session log class now includes fileHistorySnapshots Map at line 438396
• Backup files are stored per session in ~/.config/claude/file-history/<sessionId>/