v1.4.0 — statusline HUD + /fable-level

• Statusline HUD: opt-in terminal status bar showing fable level, model, branch, live context meter with tokens remaining (yellow 60% / red 85%), session output tokens, cost, duration, lines changed. Install: scripts/install-statusline.sh (refuses to clobber an existing statusline without --force). ~50ms render, local files only.
• /fable-level command: pin lite|full|deep or return to auto from chat; persists across sessions.
• SessionStart hook now keeps the installed statusline copy in sync with plugin updates.