feat(new-setup-2): bundle Telegram install into one script

Extract the /add-telegram preflight + install commands into
setup/install-telegram.sh so /new-setup-2 can run the adapter install
programmatically when the user picks Telegram, then hand off to
/add-telegram for credentials and pairing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

setup/install-telegram.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+# Setup helper: install-telegram — bundles the preflight + install commands
+# from the /add-telegram skill into one idempotent script so /new-setup-2 can
+# run them programmatically before continuing to credentials and pairing.
+#
+# Copies the Telegram adapter, helpers, tests, and the pair-telegram setup
+# step in from the `channels` branch; appends the self-registration import;
+# registers the `pair-telegram` entry in the setup STEPS map; installs the
+# pinned @chat-adapter/telegram package; builds. All steps are safe to re-run.
+set -euo pipefail
+
+PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$PROJECT_ROOT"
+
+echo "=== NANOCLAW SETUP: INSTALL_TELEGRAM ==="
+
+CHANNEL_FILES=(
+  src/channels/telegram.ts
+  src/channels/telegram-pairing.ts
+  src/channels/telegram-pairing.test.ts
+  src/channels/telegram-markdown-sanitize.ts
+  src/channels/telegram-markdown-sanitize.test.ts
+  setup/pair-telegram.ts
+)
+
+needs_install=false
+for f in "${CHANNEL_FILES[@]}"; do
+  [[ -f "$f" ]] || needs_install=true
+done
+grep -q "import './telegram.js';" src/channels/index.ts || needs_install=true
+grep -q "'pair-telegram':" setup/index.ts || needs_install=true
+grep -q '"@chat-adapter/telegram"' package.json || needs_install=true
+[[ -d node_modules/@chat-adapter/telegram ]] || needs_install=true
+
+if ! $needs_install; then
+  echo "STATUS: already-installed"
+  echo "=== END ==="
+  exit 0
+fi
+
+echo "STEP: fetch-channels-branch"
+git fetch origin channels
+
+echo "STEP: copy-files"
+for f in "${CHANNEL_FILES[@]}"; do
+  git show "origin/channels:$f" > "$f"
+done
+
+echo "STEP: register-import"
+if ! grep -q "import './telegram.js';" src/channels/index.ts; then
+  printf "import './telegram.js';\n" >> src/channels/index.ts
+fi
+
+echo "STEP: register-setup-step"
+if ! grep -q "'pair-telegram':" setup/index.ts; then
+  awk '
+    { print }
+    /register: \(\) => import/ && !inserted {
+      print "  '\''pair-telegram'\'': () => import('\''./pair-telegram.js'\''),"
+      inserted = 1
+    }
+  ' setup/index.ts > setup/index.ts.tmp && mv setup/index.ts.tmp setup/index.ts
+fi
+
+echo "STEP: pnpm-install"
+pnpm install @chat-adapter/telegram@4.26.0
+
+echo "STEP: pnpm-build"
+pnpm run build
+
+echo "STATUS: installed"
+echo "=== END ==="