Add capture-proof for sharp Playwright proof screenshots

user/agents/skills/ticket/scripts/capture-proof

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+# Screenshots a running app for a ticket's proof with Playwright. See: capture-proof help
+# The first run installs a pinned Playwright and its Chromium into ~/.cache/ticket-page.
+set -euo pipefail
+version=1.60.0
+here="$(dirname "$(readlink -f "$0")")"
+pw="${XDG_CACHE_HOME:-$HOME/.cache}/ticket-page/playwright"
+command -v node >/dev/null 2>&1 || { echo "capture-proof: node is not on PATH" >&2; exit 127; }
+if [[ "$(node -p "try{require('$pw/node_modules/playwright/package.json').version}catch{''}" 2>/dev/null)" != "$version" ]]; then
+  echo "capture-proof: installing Playwright $version into $pw" >&2
+  mkdir -p "$pw"
+  [[ -f "$pw/package.json" ]] || echo '{"private":true}' > "$pw/package.json"
+  (cd "$pw" && npm install --silent --no-audit --no-fund "playwright@$version") >&2
+  node "$pw/node_modules/playwright/cli.js" install chromium >&2
+fi
+exec node "$here/capture-proof.ts" "$@"