Adds .claude/statusline.sh (reads context_window.used_percentage +
context_window_size straight from the statusLine JSON; green<70/yellow/red
bar) and wires it via .claude/settings.json statusLine. Committed in-repo so
it follows boma to any clone, matching how .claude/ already tracks hooks +
plugins.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
