feat: add gifgrep skill

skills/gifgrep/SKILL.md

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+---
+name: gifgrep
+description: Search GIF providers with CLI/TUI, download results, and extract stills/sheets.
+homepage: https://gifgrep.com
+metadata: {"clawdis":{"emoji":"🧲","requires":{"bins":["gifgrep"]},"install":[{"id":"brew","kind":"brew","formula":"steipete/tap/gifgrep","bins":["gifgrep"],"label":"Install gifgrep (brew)"},{"id":"go","kind":"go","module":"github.com/steipete/gifgrep/cmd/gifgrep@latest","bins":["gifgrep"],"label":"Install gifgrep (go)"}]}}
+---
+
+# gifgrep
+
+Use `gifgrep` to search GIF providers (Tenor/Giphy), browse in a TUI, download results, and extract stills or sheets.
+
+GIF-Grab (gifgrep workflow)
+- Search → preview → download → extract (still/sheet) for fast review and sharing.
+
+Quick start
+- `gifgrep cats --max 5`
+- `gifgrep cats --format url | head -n 5`
+- `gifgrep search --json cats | jq '.[0].url'`
+- `gifgrep tui "office handshake"`
+- `gifgrep cats --download --max 1 --format url`
+
+TUI + previews
+- TUI: `gifgrep tui "query"`
+- CLI still previews: `--thumbs` (Kitty/Ghostty only; still frame)
+
+Download + reveal
+- `--download` saves to `~/Downloads`
+- `--reveal` shows the last download in Finder
+
+Stills + sheets
+- `gifgrep still ./clip.gif --at 1.5s -o still.png`
+- `gifgrep sheet ./clip.gif --frames 9 --cols 3 -o sheet.png`
+- Sheets = single PNG grid of sampled frames (great for quick review, docs, PRs, chat).
+- Tune: `--frames` (count), `--cols` (grid width), `--padding` (spacing).
+
+Providers
+- `--source auto|tenor|giphy`
+- `GIPHY_API_KEY` required for `--source giphy`
+- `TENOR_API_KEY` optional (Tenor demo key used if unset)
+
+Output
+- `--json` prints an array of results (`id`, `title`, `url`, `preview_url`, `tags`, `width`, `height`)
+- `--format` for pipe-friendly fields (e.g., `url`)
+
+Environment tweaks
+- `GIFGREP_SOFTWARE_ANIM=1` to force software animation
+- `GIFGREP_CELL_ASPECT=0.5` to tweak preview geometry