Add SessionStart hook to install gh CLI in cloud sessions (#3308)

Co-authored-by: Marvin Context Protocol <41898282+Marvin Context Protocol@users.noreply.github.com>
Co-authored-by: Jeremiah Lowin <jlowin@users.noreply.github.com>

.claude/hooks/session-init.sh

@@ -0,0 +1,26 @@
+#!/bin/bash
+set -e
+
+# Only run in remote/cloud environments
+if [ "$CLAUDE_CODE_REMOTE" != "true" ]; then
+  exit 0
+fi
+
+command -v gh &> /dev/null && exit 0
+
+LOCAL_BIN="$HOME/.local/bin"
+mkdir -p "$LOCAL_BIN"
+
+ARCH=$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/')
+VERSION=$(curl -fsSL https://api.github.com/repos/cli/cli/releases/latest | grep '"tag_name"' | cut -d'"' -f4)
+TARBALL="gh_${VERSION#v}_linux_${ARCH}.tar.gz"
+
+echo "Installing gh ${VERSION}..."
+TEMP=$(mktemp -d)
+trap 'rm -rf "$TEMP"' EXIT
+curl -fsSL "https://github.com/cli/cli/releases/download/${VERSION}/${TARBALL}" | tar -xz -C "$TEMP"
+cp "$TEMP"/gh_*/bin/gh "$LOCAL_BIN/gh"
+chmod 755 "$LOCAL_BIN/gh"
+
+[ -n "$CLAUDE_ENV_FILE" ] && echo "export PATH=\"$LOCAL_BIN:\$PATH\"" >> "$CLAUDE_ENV_FILE"
+echo "gh installed: $("$LOCAL_BIN/gh" --version | head -1)"

.claude/settings.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "SessionStart": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bash \"$CLAUDE_PROJECT_DIR\"/.claude/hooks/session-init.sh",
+            "timeout": 120
+          }
+        ]
+      }
+    ]
+  }
+}