Fallback ultra-compressed communication mode. Cuts token usage ~75% by dropping filler, articles, and pleasantries while keeping full technical accuracy. Use ONLY when context is critically long and compressing output is necessary to continue. Not a strategy — token discipline comes from code shape (small functions, unique names, headless tests), not terser prompts. Use when user says "caveman mode", "terse mode", "less tokens", "be brief", or invokes /terse-mode.
