refactor: apply FAR-95 skills review follow-ups

- Remove `playwright-ephemeral/` and `shannon/` entirely per board direction
- Fix `minimax-image-generation/SKILL.md` so YAML frontmatter is at line 1
- Add `minimax-image-generation/scripts/generate.sh` (argparse, error-checked, executable) and document invoking it via `bash scripts/generate.sh ...`
- Deduplicate `minimax-image-generation/CLAUDE.md` against SKILL.md
- `github-app-token`: write token to `$GH_CONFIG_DIR/.gh-token` (preferred) or `$AGENT_HOME/.gh-token` (fallback), fail loudly if neither is set instead of leaking to `mktemp`
- Refresh root `CLAUDE.md` to match actual directory contents and patterns
- Add root `README.md` with human-facing skills index

Co-Authored-By: Paperclip <noreply@paperclip.ing>

github-app-token/scripts/generate-token.sh

@@ -49,9 +49,20 @@ RESPONSE=$(curl -sf -X POST \
 TOKEN=$(echo "$RESPONSE" | jq -r '.token // empty')
 [[ -z "$TOKEN" ]] && die "No token in GitHub response: $RESPONSE"
 
-# --- Write token to file ---
-GH_TOKEN_FILE="${AGENT_HOME:+${AGENT_HOME}/.gh-token}"
-GH_TOKEN_FILE="${GH_TOKEN_FILE:-$(mktemp)}"
+# --- Resolve token file location ---
+# Prefer GH_CONFIG_DIR (so the token lives alongside the per-agent gh config),
+# fall back to AGENT_HOME, fail loudly if neither is set rather than silently
+# writing to /tmp and leaking the token.
+if [[ -n "${GH_CONFIG_DIR:-}" ]]; then
+  GH_TOKEN_DIR="$GH_CONFIG_DIR"
+elif [[ -n "${AGENT_HOME:-}" ]]; then
+  GH_TOKEN_DIR="$AGENT_HOME"
+else
+  die "Neither GH_CONFIG_DIR nor AGENT_HOME is set — refusing to write the token to a default location"
+fi
+
+mkdir -p "$GH_TOKEN_DIR"
+GH_TOKEN_FILE="$GH_TOKEN_DIR/.gh-token"
 
 printf '%s' "$TOKEN" > "$GH_TOKEN_FILE"
 chmod 600 "$GH_TOKEN_FILE"