fix: WSL/Linux compatibility for statusline-command.sh

[0xAdamFortuna]

Summary

Fixes statusline-command.sh to work correctly on WSL/Linux systems. Previously, the statusline displayed "STATUSLINE: Unknown" and "Context 0%" with multiple errors due to macOS-specific commands.

Issues resolved:

• jq: command not found - documented as required dependency
• stat: invalid option -- 'f' - macOS stat syntax incompatible with Linux
• /dev/tty: No such device or address - TTY device inaccessible in hook contexts
• integer expression expected - empty context_max variable

Changes

1. Added cross-platform get_file_mtime() function

   • Detects OS using $OSTYPE
   • Uses stat -f %m on macOS, stat -c %Y on Linux
   • Replaces three hardcoded stat -f %m calls

2. Fixed TTY detection for non-interactive contexts

   • Changed from /dev/tty file access to -t 0 (test if stdin is terminal)
   • Prevents errors when running in hook contexts where TTY is unavailable

3. Added default value for context_max variable

   • Defaults to 0 when JSON input is empty/missing
   • Prevents bash arithmetic errors

Test plan

• Tested on WSL2 Ubuntu 24.04 with Warp terminal
• Verified statusline displays location, weather, context, and learning signals correctly
• Confirmed no error messages in output
• Needs verification on macOS to ensure no regression

Related issues

• Partially addresses Unable to install PAI on an Ubuntu WSL instance #438 (WSL compatibility)
• Related to Statusline pack reads PAI version from invalid settings.json field #446 (statusline settings)
• Related to Invalid file paths break Windows checkout (colons in filenames) #457 (Windows path issues)

Note

jq is required for statusline to function. Consider adding to install documentation or install.ts dependency check.

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