remove github-app-token skill entirely

No backward compatibility — the script, SKILL.md, and all CLAUDE.md
references are deleted.

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

github-app-token/scripts/generate_token.sh

@@ -1,78 +0,0 @@
-#!/usr/bin/env bash
-# Generate a GitHub App Installation Access Token and authenticate the gh CLI
-#
-# Required environment variables:
-#   GITHUB_APP_ID              - The GitHub App's numeric ID
-#   GITHUB_APP_INSTALLATION_ID - The numeric Installation ID for the target org/user
-#   GITHUB_APP_PEM_FILE        - Path to the PEM-encoded private key file
-
-set -euo pipefail
-
-# Parse flags
-RAW_MODE=false
-for arg in "$@"; do
-  case "$arg" in
-    --raw) RAW_MODE=true ;;
-    *) echo "error: unknown flag: $arg" >&2; exit 1 ;;
-  esac
-done
-
-die() {
-  echo "error: $1" >&2
-  exit 1
-}
-
-if [[ -z "${GITHUB_APP_ID:-}" ]]; then
-  die "GITHUB_APP_ID is not set"
-fi
-
-if [[ -z "${GITHUB_APP_INSTALLATION_ID:-}" ]]; then
-  die "GITHUB_APP_INSTALLATION_ID is not set"
-fi
-
-if [[ -z "${GITHUB_APP_PEM_FILE:-}" ]]; then
-  die "GITHUB_APP_PEM_FILE is not set"
-fi
-
-if [[ ! -f "${GITHUB_APP_PEM_FILE}" ]]; then
-  die "PEM file not found: ${GITHUB_APP_PEM_FILE}"
-fi
-
-# Function to base64 encode with URL-safe characters
-b64enc() { openssl enc -base64 -A | tr '+/' '-_' | tr -d '='; }
-
-NOW=$(date +%s)
-# JWT valid for 10 minutes (GitHub limit)
-IAT=$NOW
-EXP=$((NOW + 10 * 60))
-
-# Create the JWT header and payload (requires jq for compact formatting just to be safe)
-HEADER=$(printf '{"alg":"RS256","typ":"JWT"}' | jq -r -c .)
-PAYLOAD=$(printf '{"iat":%s,"exp":%s,"iss":"%s"}' "${IAT}" "${EXP}" "${GITHUB_APP_ID}" | jq -r -c .)
-
-SIGNED_CONTENT=$(printf '%s' "${HEADER}" | b64enc).$(printf '%s' "${PAYLOAD}" | b64enc)
-
-# Sign the content with the private key
-SIG=$(printf '%s' "${SIGNED_CONTENT}" | openssl dgst -binary -sha256 -sign "${GITHUB_APP_PEM_FILE}" | b64enc)
-
-JWT=$(printf '%s.%s' "${SIGNED_CONTENT}" "${SIG}")
-
-# Exchange JWT for an installation access token
-RESPONSE=$(curl -s -X POST \
-  -H "Authorization: Bearer ${JWT}" \
-  -H "Accept: application/vnd.github+json" \
-  -H "X-GitHub-Api-Version: 2022-11-28" \
-  "https://api.github.com/app/installations/${GITHUB_APP_INSTALLATION_ID}/access_tokens")
-
-INSTALL_TOKEN=$(printf '%s' "${RESPONSE}" | jq -r '.token // empty')
-
-if [[ -z "${INSTALL_TOKEN}" ]]; then
-  die "failed to generate installation token. Response: ${RESPONSE}"
-fi
-
-# Output the token
-if [[ "$RAW_MODE" == true ]]; then
-  printf '%s' "${INSTALL_TOKEN}"
-else
-  echo "export GH_TOKEN=\"${INSTALL_TOKEN}\""
-fi