fix: guard inotifywait against silent failure

set -e is inherited by the watcher subshell. If inotifywait exits
non-zero (e.g. watched directory deleted, watch limit exhausted),
the subshell dies silently. Guard with if-check and shut down on
failure instead.

Signed-off-by: Matej Vašek <matejvasek@gmail.com>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: matejvasek

init.sh

@@ -93,7 +93,11 @@ start_backend_watcher() {
   echo "Starting backend file watcher..."
   (
     while true; do
-      inotifywait -r -e modify,create,delete,move --include '\.(go|mod|sum)$' backend/ >/dev/null 2>&1
+      if ! inotifywait -r -e modify,create,delete,move --include '\.(go|mod|sum)$' backend/ >/dev/null 2>&1; then
+        echo "[watcher] inotifywait failed. Shutting down dev environment."
+        stop_dev
+        break
+      fi
       sleep 1  # debounce
 
       echo "[watcher] Detected change, rebuilding backend..."