Conversation history lost when changing directories with cd command

Bug Description

Conversation history is not recorded after changing to a subdirectory using the cd command. All conversations that occur after cd subdirectory are lost and not available in subsequent sessions.

Environment

• Platform: WSL2 (Ubuntu 24.04)
• Claude Code versions tested: 1.0.64 and 1.0.40
• Verified on clean installation with no custom configurations

Steps to Reproduce

1. Start claude in a project directory
2. Have a conversation (e.g., "What's your favorite animal?")
3. Create and cd into a subdirectory: mkdir abc && cd abc
4. Continue conversation (e.g., "What's your favorite food?")
5. Return to parent directory: cd ..
6. Continue conversation (e.g., "What's your favorite movie?")
7. Exit with /exit
8. Start new session with claude -c
9. Observe that only the conversation before cd abc is remembered

Expected Behavior

All conversations should be recorded and available in subsequent sessions, regardless of the current working directory.

Actual Behavior

• Conversations in the main directory: ✅ Recorded
• Conversations after cd subdirectory: ❌ Lost
• Conversations after returning with cd ..: ❌ Lost

Impact

This is a critical issue for developers who:

• Work across multiple subdirectories during development
• Lose important context and decisions made during subdirectory work
• Cannot resume conversations properly after directory changes
• May not realize conversations are being lost until starting a new session

Additional Information

• Tested on multiple Claude Code versions with same result
• Reproduced on clean WSL2 installation
• No error messages or warnings are shown
• Users have no way to know their conversations aren't being recorded

This appears to be a fundamental issue with how Claude Code tracks conversation history relative to directory changes.