Bug: resume fails with 'g9H is not a function' - all session-env directories are empty

Bug Description

Session resume fails with error g9H is not a function even on fresh/new sessions. All previous sessions are also unable to resume.

Steps to Reproduce

1. Have an existing Claude Code session
2. Attempt to resume it (either automatically or via /resume)
3. Error: g9H is not a function

Root Cause Analysis

All ~/.claude/session-env/{session-id}/ directories are empty (0 bytes). There are 35 session directories and none contain any state files.

Expected files that should exist in each session-env directory:

• state.json or similar state persistence file

Without these files, the resume logic attempts to call a function (g9H) on undefined/null data.

Environment

• Platform: macOS (darwin 25.3.0)
• Claude Code version: 2.1.120 → upgraded to 2.1.123
• Installation: npm global (/opt/homebrew/lib/node_modules/@anthropic-ai/claude-code)
• teammateMode: "tmux" enabled in settings

Additional Context

• This affects ALL sessions, not just one specific session
• Even sessions created after the upgrade fail to resume
• The session-data/*.tmp files exist and contain valid session content
• The session-env/ directories are created but remain empty
• Error occurs at session restore/bootstrap phase

Expected Behavior

Sessions should be resumable. The session-env/ directories should contain state files necessary for session recovery.

Impact

Critical - No sessions can be resumed, forcing users to start new sessions and lose conversation history.