feat(skill): 本地 git 门禁 + 项目级安装 + 覆盖率与第三方扫描

- hooks/git/{pre-commit,pre-push} + scripts/install-git-hooks.sh（Gitea Actions 无 runner，本地兜底）
- install-skills.sh: --scope project --project-dir（装到项目 .agents/skills）
- scripts/scan-installed.sh: 扫第三方已装技能（33 个，0 高危）
- generate-catalog: has_evals/has_docs + coverage；validate --coverage + 路由一致性检查
- SCOPE 覆盖率路线图（3-4 周补齐 40 个技能的 evals 与四段式文档）
- MAINTENANCE/README/CHANGELOG 同步

scripts/scan-installed.sh

@@ -0,0 +1,58 @@
+#!/usr/bin/env bash
+# scan-installed.sh — 扫描「已安装但不是本仓库管理」的第三方技能，找出高风险内容。
+# 用法: ./scripts/scan-installed.sh [--strict] [dir ...]
+#   默认扫描 ~/.agents/skills 与 $DSH_HOME/skills
+#   --strict: 有高危项则退出码 1
+set -uo pipefail
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+STRICT=0
+dirs=()
+for a in "$@"; do
+  case "$a" in
+    --strict) STRICT=1 ;;
+    *) dirs+=("$a") ;;
+  esac
+done
+if [[ ${#dirs[@]} -eq 0 ]]; then
+  dirs+=("${HOME}/.agents/skills")
+  [[ -n "${DSH_HOME:-}" ]] && dirs+=("${DSH_HOME}/skills")
+fi
+
+HIGH_PATTERNS=(
+  'rm[[:space:]]+-[a-zA-Z]*r[a-zA-Z]*[[:space:]]+/($|[[:space:]])'
+  'curl[^|]*\|[[:space:]]*(ba|z)?sh'
+  'wget[^|]*\|[[:space:]]*(ba|z)?sh'
+  'chmod[[:space:]]+777'
+  'BEGIN (RSA|OPENSSH|EC|DSA) PRIVATE KEY'
+  'sk-[A-Za-z0-9]{16,}'
+  'AKIA[0-9A-Z]{16}'
+  'ghp_[A-Za-z0-9]{20,}'
+)
+
+managed=""
+for st in "${HOME}/.agents/.ai-proj-helper-installed-skills.json" \
+          "${DSH_HOME:-/nonexistent}/.ai-proj-helper-installed-skills.json"; do
+  [[ -f "$st" ]] && managed="$managed $(python3 -c "import json;print(' '.join(json.load(open('$st')).keys()))" 2>/dev/null)"
+done
+
+total=0 high=0 third=0
+for dir in "${dirs[@]}"; do
+  [[ -d "$dir" ]] || continue
+  for entry in "$dir"/*; do
+    [[ -e "$entry" || -L "$entry" ]] || continue
+    name="$(basename "$entry")"
+    [[ " $managed " == *" $name "* ]] && continue
+    third=$((third + 1))
+    for pattern in "${HIGH_PATTERNS[@]}"; do
+      while IFS= read -r hit; do
+        echo "[HIGH] $name: ${hit#*:}"
+        high=$((high + 1)); total=$((total + 1))
+      done < <(grep -rnE --include='*.md' --include='*.sh' --include='*.py' --include='*.js' --include='*.ts' --include='*.json' -- "$pattern" "$entry" 2>/dev/null | cut -c1-180)
+    done
+  done
+done
+
+echo ""
+echo "扫描完成：第三方技能 $third 个，高危 $high 处"
+[[ "$STRICT" == 1 && "$high" -gt 0 ]] && { echo "存在高危第三方技能，需人工确认来源。"; exit 1; }
+exit 0