feat(pkg): 匯入 jsc-pkg 技能組

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/latest-version.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env sh
+# latest-version.sh — 查詢套件最新且穩定的版本號。
+# 用法: latest-version.sh <ecosystem> <name>
+#   ecosystem: nodejs | python | dotnet
+# 輸出: 版本號一行；查不到 exit 4
+set -u
+eco="${1:?ecosystem required (nodejs|python|dotnet)}"
+name="${2:?package name required}"
+
+case "$eco" in
+  nodejs)
+    v=$(curl -sSf "https://registry.npmjs.org/$name/latest" 2>/dev/null \
+      | python3 2>/dev/null -c 'import json,sys;print(json.load(sys.stdin).get("version",""))') ;;
+  python)
+    v=$(curl -sSf "https://pypi.org/pypi/$name/json" 2>/dev/null \
+      | python3 2>/dev/null -c 'import json,sys;print(json.load(sys.stdin)["info"]["version"])') ;;
+  dotnet)
+    lname=$(printf '%s' "$name" | tr '[:upper:]' '[:lower:]')
+    v=$(curl -sSf "https://api.nuget.org/v3-flatcontainer/$lname/index.json" 2>/dev/null \
+      | python3 2>/dev/null -c '
+import json,sys,re
+vs=json.load(sys.stdin).get("versions",[])
+stable=[x for x in vs if re.match(r"^[0-9]+(\.[0-9]+)*$",x)]
+print((stable or vs)[-1] if (stable or vs) else "")') ;;
+  *) echo "unknown ecosystem: $eco" >&2; exit 2 ;;
+esac
+
+[ -n "${v:-}" ] || { echo "not found: $eco/$name" >&2; exit 4; }
+printf '%s\n' "$v"