[Bug] tmux pane spawning fails in GitBash with tmux enabled

Bug Description
can't swapn tmux pane running in GitBash with tmux enable

Environment Info

• Platform: win32
• Terminal: tmux + alacritty + windows 11
• Version: 2.1.34
• Feedback ID: 55b5668b-4554-444f-9e3c-619fad0790d5

Errors

[{"error":"Error: [TmuxBackend] Failed to get pane count for #session_name:#window_index (exit 1): can't find session: #session_name\n    at getCurrentWindowPaneCount (B:/~BUN/root/claude.exe:2026:837)\n    at async createTeammatePaneWithLeader (B:/~BUN/root/claude.exe:2029:496)\n    at async createTeammatePaneInSwarmView (B:/~BUN/root/claude.exe:2025:16560)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:56:51.559Z"},{"error":"Error: Could not determine pane count for current window\n    at createTeammatePaneWithLeader (B:/~BUN/root/claude.exe:2029:523)\n    at async createTeammatePaneInSwarmView (B:/~BUN/root/claude.exe:2025:16560)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:56:51.560Z"},{"error":"Error: [TmuxBackend] Failed to get pane count for #session_name:#window_index (exit 1): can't find session: #session_name\n    at getCurrentWindowPaneCount (B:/~BUN/root/claude.exe:2026:837)\n    at async createTeammatePaneWithLeader (B:/~BUN/root/claude.exe:2029:496)\n    at async createTeammatePaneInSwarmView (B:/~BUN/root/claude.exe:2025:16560)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:00.843Z"},{"error":"Error: Could not determine pane count for current window\n    at createTeammatePaneWithLeader (B:/~BUN/root/claude.exe:2029:523)\n    at async createTeammatePaneInSwarmView (B:/~BUN/root/claude.exe:2025:16560)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:00.843Z"},{"error":"Error: EPERM: operation not permitted, symlink 'C:\\Users\\nikiforovall\\.claude\\projects\\C--Users-nikiforovall-dev\\e8a039b3-3286-489a-a517-9b6e8c564da5\\subagents\\agent-a537b02.jsonl' -> 'C:\\Users\\NIKIFO~1\\AppData\\Local\\Temp\\claude\\C--Users-nikiforovall-dev\\tasks\\a537b02.output'\n    at symlinkSync (unknown)\n    at kFH (B:/~BUN/root/claude.exe:1316:1154)\n    at kRD (B:/~BUN/root/claude.exe:1428:1523)\n    at <anonymous> (B:/~BUN/root/claude.exe:2043:972)\n    at <anonymous> (B:/~BUN/root/claude.exe:2043:1893)\n    at run (node:async_hooks:62:22)\n    at sPH (B:/~BUN/root/claude.exe:1173:94)\n    at call (B:/~BUN/root/claude.exe:2043:667)\n    at async cUE (B:/~BUN/root/claude.exe:3465:13995)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:07.972Z"},{"error":"Error: EPERM: operation not permitted, symlink 'C:\\Users\\nikiforovall\\.claude\\projects\\C--Users-nikiforovall-dev\\e8a039b3-3286-489a-a517-9b6e8c564da5\\subagents\\agent-ac6fe93.jsonl' -> 'C:\\Users\\NIKIFO~1\\AppData\\Local\\Temp\\claude\\C--Users-nikiforovall-dev\\tasks\\ac6fe93.output'\n    at symlinkSync (unknown)\n    at kFH (B:/~BUN/root/claude.exe:1316:1154)\n    at kRD (B:/~BUN/root/claude.exe:1428:1523)\n    at <anonymous> (B:/~BUN/root/claude.exe:2043:972)\n    at <anonymous> (B:/~BUN/root/claude.exe:2043:1893)\n    at run (node:async_hooks:62:22)\n    at sPH (B:/~BUN/root/claude.exe:1173:94)\n    at call (B:/~BUN/root/claude.exe:2043:667)\n    at async cUE (B:/~BUN/root/claude.exe:3465:13995)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:10.760Z"},{"error":"Error: EPERM: operation not permitted, symlink 'C:\\Users\\nikiforovall\\.claude\\projects\\C--Users-nikiforovall-dev\\e8a039b3-3286-489a-a517-9b6e8c564da5\\subagents\\agent-aa3e5dd.jsonl' -> 'C:\\Users\\NIKIFO~1\\AppData\\Local\\Temp\\claude\\C--Users-nikiforovall-dev\\tasks\\aa3e5dd.output'\n    at symlinkSync (unknown)\n    at kFH (B:/~BUN/root/claude.exe:1316:1154)\n    at kRD (B:/~BUN/root/claude.exe:1428:1523)\n    at <anonymous> (B:/~BUN/root/claude.exe:2043:972)\n    at <anonymous> (B:/~BUN/root/claude.exe:2043:1893)\n    at run (node:async_hooks:62:22)\n    at sPH (B:/~BUN/root/claude.exe:1173:94)\n    at call (B:/~BUN/root/claude.exe:2043:667)\n    at async cUE (B:/~BUN/root/claude.exe:3465:13995)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:13.700Z"},{"error":"Error: Request was aborted.\n    at XW$ (B:/~BUN/root/claude.exe:838:99554)\n    at lnI (B:/~BUN/root/claude.exe:5693:4372)\n    at nnI (B:/~BUN/root/claude.exe:5698:7410)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:32.437Z"},{"error":"Error: Request was aborted.\n    at makeRequest (B:/~BUN/root/claude.exe:333:3940)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:32.439Z"},{"error":"Error: Request was aborted.\n    at makeRequest (B:/~BUN/root/claude.exe:333:3940)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-02-06T12:57:32.440Z"},{"error":"Error: […

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