fix(install): stop existing daemons before binary replacement (#945)

Stop existing daemons before binary replacement during install

Prevents file lock race condition by gracefully stopping bd daemons
before replacing the binary. Safe for fresh installs (skips if bd not found).

scripts/install.sh

@@ -109,6 +109,25 @@ detect_platform() {
     echo "${os}_${arch}"
 }
 
+# Stop existing daemons before upgrade (safe for fresh installs)
+stop_existing_daemons() {
+    # Skip if bd isn't installed (fresh install)
+    if ! command -v bd &> /dev/null; then
+        return 0
+    fi
+
+    log_info "Stopping existing bd daemons before upgrade..."
+
+    # Try graceful shutdown via bd daemons killall
+    if bd daemons killall 2>/dev/null; then
+        log_success "Stopped existing daemons"
+    else
+        log_warning "No daemons running or failed to stop (continuing anyway)"
+    fi
+
+    return 0
+}
+
 # Download and install from GitHub releases
 install_from_release() {
     log_info "Installing bd from GitHub releases..."
@@ -449,6 +468,9 @@ main() {
     platform=$(detect_platform)
     log_info "Platform: $platform"
 
+    # Stop any running daemons before replacing binary
+    stop_existing_daemons
+
     # Try downloading from GitHub releases first
     if install_from_release "$platform"; then
         verify_installation