feat(vercel): vendor vercel-labs/agent-skills (9 skills) + sync script

scripts/sync-vercel-skills.sh

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+#!/usr/bin/env bash
+# Sync vercel-labs/agent-skills into skills/vercel/ (vendored read-only mirror).
+# Re-run anytime to pull upstream updates. Build .zip artifacts are excluded.
+#
+#   bash scripts/sync-vercel-skills.sh
+#
+set -euo pipefail
+UPSTREAM="${VERCEL_SKILLS_UPSTREAM:-https://github.com/vercel-labs/agent-skills.git}"
+PREFIX="skills/vercel"
+REPO_ROOT="$(git rev-parse --show-toplevel)"
+WORK="$(mktemp -d)"; trap 'rm -rf "$WORK"' EXIT
+
+git clone --quiet --depth=1 "$UPSTREAM" "$WORK/up"
+SHA="$(git -C "$WORK/up" rev-parse HEAD)"
+dest="$REPO_ROOT/$PREFIX"; mkdir -p "$dest"
+
+# Replace vendored skill dirs (preserve UPSTREAM.md), excluding build artifacts
+find "$dest" -mindepth 1 -maxdepth 1 -type d -exec rm -rf {} +
+for d in "$WORK/up/skills"/*/; do
+  rsync -a --exclude='*.zip' "$d" "$dest/$(basename "$d")/"
+done
+sed -i -E "s|^- Upstream commit:.*|- Upstream commit: $SHA|" "$dest/UPSTREAM.md" 2>/dev/null || true
+
+cd "$REPO_ROOT"
+git add "$PREFIX"
+if git diff --cached --quiet; then
+  echo "Already up to date with $SHA"
+else
+  git commit -q -m "chore(vercel): sync agent-skills to ${SHA:0:7}"
+  echo "OK: $PREFIX synced to $SHA"
+fi

skills/vercel/UPSTREAM.md

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+# Vendored from vercel-labs/agent-skills
+
+Read-only mirror of https://github.com/vercel-labs/agent-skills
+
+- Upstream commit: f8a72b9603728bb92a217a879b7e62e43ad76c81
+- Vendored: 2026-06-30 via `git subtree` (prefix skills/vercel)
+- License: MIT (declared in upstream README; upstream ships no LICENSE file)
+- Update: run `bash scripts/sync-vercel-skills.sh` from the skills repo root.
+  It re-pulls upstream and strips build `.zip` artifacts automatically.
+
+Do not hand-edit these skills — local changes are overwritten on the next sync.
+Contribute fixes upstream at vercel-labs/agent-skills.