Fix bootstrap.sh: go not found on PATH after install

/usr/local/bin wasn't guaranteed to be on PATH in non-interactive
shells, so the symlinked go binary was invisible to later steps.
Export PATH explicitly and fail fast if go is still missing.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

bootstrap.sh

@@ -37,15 +37,23 @@ export DEBIAN_FRONTEND=noninteractive
 apt-get update
 apt-get install -y git wireguard-tools nftables curl ca-certificates
 
+export PATH="/usr/local/go/bin:/usr/local/bin:$PATH"
+
 if ! command -v go >/dev/null 2>&1; then
 	echo "Installing Go ${GO_VERSION}..."
 	ARCH="$(dpkg --print-architecture)"
 	curl -fsSL "https://go.dev/dl/go${GO_VERSION}.linux-${ARCH}.tar.gz" -o /tmp/go.tar.gz
+	rm -rf /usr/local/go
 	tar -C /usr/local -xzf /tmp/go.tar.gz
 	ln -sf /usr/local/go/bin/go /usr/local/bin/go
 	rm -f /tmp/go.tar.gz
 fi
 
+if ! command -v go >/dev/null 2>&1; then
+	echo "go still not found on PATH after install attempt (/usr/local/go/bin)." >&2
+	exit 1
+fi
+
 if [[ -d "$SRC_DIR/.git" ]]; then
 	echo "Updating existing checkout at $SRC_DIR..."
 	git -C "$SRC_DIR" fetch --depth 1 origin "$REF"