feat(statusline): add --compact mode

[derekrprice]

Summary

Adds an opt-in --compact flag to Releases/v4.0.3/.claude/statusline-command.sh that collapses the three banner sections (header, USE, PWD) into a single dense line — useful for short terminal heights or users who prefer minimal status output.

What it does

• Parse --compact flag from script arguments (default: off; no behavior change without the flag).
• When --compact is set, emit a single dense line in place of the header + USE + PWD sections:

  CTX:XX% | 5H:XX%↻HH:MM | 7D:XX%↻HH:MM | S:$X.XX
  

• Pre-compute reset times and context-% scaling once, so the dense line and the full USE section share the same values (avoids drift / double work).
• Pipe all output through a new ANSI-aware truncate_output filter that caps each line at 72 visible chars (matching the separator width). This is needed because Claude Code's statusline subprocess receives a stale TTY width, so runtime width detection is unreliable; fixing the truncation width sidesteps that.

Enabling it

"statusLine": {
  "type": "command",
  "command": "~/.claude/statusline-command.sh --compact"
}

🙋 About the destination

I targeted Releases/v4.0.3/.claude/statusline-command.sh because that's the file that's actually being shipped to users in v4.0.3 (matches byte-for-byte what my local installation runs). The top-level .claude/statusline-command.sh at repo root is 833 lines and appears to be pre-v4.0.0 content that survived commit e3ee9ad "Revert PAI v4.0.0 — Lean and Mean" and hasn't been touched since — so patching it would have diverged from the actual shipped statusline.

I guessed on the target file. If you'd prefer this land somewhere else — top-level .claude/, a new Releases/v4.0.4/, a separate patch series, etc. — happy to rework. Just let me know.

Test plan

• Run with --compact: expect single dense summary line instead of the three banner sections.
• Run without --compact: expect identical output to current v4.0.3 statusline (no-op path).
• Verify long lines truncate to 72 visible chars with an ellipsis and preserved ANSI reset.
• Confirm usage / reset-time values match between dense and full modes.