VS Code: Conversation history only shows current session, older sessions not listed

Description

The VS Code extension conversation history panel only displays the current active session. Older conversations are not listed, despite .jsonl files being present on disk.

Environment

• Extension version: anthropic.claude-code-2.1.70-win32-x64
• OS: Windows 10 Pro 10.0.19045
• VS Code workspace: Opened via UNC network path

Steps to Reproduce

1. Open VS Code with a workspace on a UNC network share
2. Have multiple prior Claude Code conversations (43 .jsonl files in this case)
3. Open the Claude Code conversation history panel
4. Only the current session appears under Today - no older sessions listed

Evidence

• 43 .jsonl conversation files exist in the project directory spanning March 1-6
• History panel shows only 1 conversation (the current one)
• Files range from 708 bytes to 8MB, so they contain real conversation data
• No stale IDE lock files present - only the active session lock exists

Additional Context

• Developer: Reload Window causes the current session to also disappear from the history panel (it restarts fresh)
• The workspace is consistently opened via the same VS Code workspace file (auto-loaded on startup), so the UNC path should be stable
• This may be a regression from a recent update (history was working in earlier versions)

Expected Behavior

All 43 conversations should appear in the history panel, grouped by date.