galmuri:explain — Inline reader-side summary

Prerequisites

• scripts/preflight.sh passes (jq, bats, bash).
• skills/distill/ engine is installed.

Step 1: Alias detection + Input Capture

When triggered via shrink / 줄여줘 / 압축:

if [ ! -f ".galmuri/tmp/.warned-shrink" ]; then
  echo "[deprecated] the 'shrink' trigger is routed to a context-based adapter. Scheduled for removal in a future release." >&2
  touch ".galmuri/tmp/.warned-shrink"
fi
# source_tokens < 80 → explain runs; otherwise → delegate to another adapter

• Pipe user input (a file path or stdin) into .galmuri/tmp/source-{slug}.txt. If no path is provided: "Tell me a file path or some text to explain. e.g. README.md — what should I explain?"