feat(skills): add media/transcription helpers

skills/video-frames/SKILL.md

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+---
+name: video-frames
+description: Extract frames or short clips from videos using ffmpeg.
+metadata: {"clawdis":{"requires":{"bins":["ffmpeg"]},"install":[{"id":"brew","kind":"brew","formula":"ffmpeg","bins":["ffmpeg"],"label":"Install ffmpeg (brew)"}]}}
+---
+
+# Video Frames (ffmpeg)
+
+Extract a single frame from a video, or create quick thumbnails for inspection.
+
+## Quick start
+
+First frame:
+
+```bash
+{baseDir}/scripts/frame.sh /path/to/video.mp4 --out /tmp/frame.jpg
+```
+
+At a timestamp:
+
+```bash
+{baseDir}/scripts/frame.sh /path/to/video.mp4 --time 00:00:10 --out /tmp/frame-10s.jpg
+```
+
+## Notes
+
+- Prefer `--time` for “what is happening around here?”.
+- Use a `.jpg` for quick share; use `.png` for crisp UI frames.

skills/video-frames/scripts/frame.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+usage() {
+  cat >&2 <<'EOF'
+Usage:
+  frame.sh <video-file> [--time HH:MM:SS] [--index N] --out /path/to/frame.jpg
+
+Examples:
+  frame.sh video.mp4 --out /tmp/frame.jpg
+  frame.sh video.mp4 --time 00:00:10 --out /tmp/frame-10s.jpg
+  frame.sh video.mp4 --index 0 --out /tmp/frame0.png
+EOF
+  exit 2
+}
+
+if [[ "${1:-}" == "" || "${1:-}" == "-h" || "${1:-}" == "--help" ]]; then
+  usage
+fi
+
+in="${1:-}"
+shift || true
+
+time=""
+index=""
+out=""
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --time)
+      time="${2:-}"
+      shift 2
+      ;;
+    --index)
+      index="${2:-}"
+      shift 2
+      ;;
+    --out)
+      out="${2:-}"
+      shift 2
+      ;;
+    *)
+      echo "Unknown arg: $1" >&2
+      usage
+      ;;
+  esac
+done
+
+if [[ ! -f "$in" ]]; then
+  echo "File not found: $in" >&2
+  exit 1
+fi
+
+if [[ "$out" == "" ]]; then
+  echo "Missing --out" >&2
+  usage
+fi
+
+mkdir -p "$(dirname "$out")"
+
+if [[ "$index" != "" ]]; then
+  ffmpeg -hide_banner -loglevel error -y \
+    -i "$in" \
+    -vf "select=eq(n\\,${index})" \
+    -vframes 1 \
+    "$out"
+elif [[ "$time" != "" ]]; then
+  ffmpeg -hide_banner -loglevel error -y \
+    -ss "$time" \
+    -i "$in" \
+    -frames:v 1 \
+    "$out"
+else
+  ffmpeg -hide_banner -loglevel error -y \
+    -i "$in" \
+    -vf "select=eq(n\\,0)" \
+    -vframes 1 \
+    "$out"
+fi
+
+echo "$out"