add decompress-skills.sh to extract .skill archives into repo root

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

decompress-skills.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+# decompress-skills.sh
+# Extracts each .skill file (ZIP archive) into the repo root.
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+# Allow an optional source directory argument (default: current dir)
+SRC_DIR="${1:-$SCRIPT_DIR}"
+
+shopt -s nullglob
+skill_files=("$SRC_DIR"/*.skill)
+
+if [[ ${#skill_files[@]} -eq 0 ]]; then
+    echo "No .skill files found in $SRC_DIR"
+    exit 0
+fi
+
+for skill_file in "${skill_files[@]}"; do
+    skill_name="$(basename "$skill_file" .skill)"
+    echo "  [UNZIP] $skill_name.skill → $skill_name/"
+    unzip -o "$skill_file" -d "$SCRIPT_DIR"
+done
+
+echo ""
+echo "==> Done."