fix: closes #865

Dockerfile

@@ -3,18 +3,13 @@ FROM python:3.11-slim
 WORKDIR /app
 
 # Install Python deps
-COPY requirements.txt ./
-RUN pip install --no-cache-dir -r requirements.txt websockets
-
-# Backend
 COPY nexus/ nexus/
-COPY server.py ./
+COPY server.py .
+COPY portals.json vision.json ./
+COPY robots.txt ./
+COPY index.html help.html ./
 
-# Frontend assets referenced by index.html
-COPY index.html help.html style.css app.js service-worker.js manifest.json ./
-
-# Config/data
-COPY portals.json vision.json robots.txt ./
+RUN pip install --no-cache-dir websockets
 
 EXPOSE 8765
 

bin/nexus_watchdog.py

@@ -586,8 +586,8 @@ def alert_on_failure(report: HealthReport, dry_run: bool = False) -> None:
                 logger.info("Created alert issue #%d", result["number"])
 
 
-def run_once(args: argparse.Namespace) -> bool:
-    """Run one health check cycle. Returns True if healthy."""
+def run_once(args: argparse.Namespace) -> tuple:
+    """Run one health check cycle. Returns (healthy, report)."""
     report = run_health_checks(
         ws_host=args.ws_host,
         ws_port=args.ws_port,
@@ -615,7 +615,7 @@ def run_once(args: argparse.Namespace) -> bool:
         except Exception:
             pass  # never crash the watchdog over its own heartbeat
 
-    return report.overall_healthy
+    return report.overall_healthy, report
 
 
 def main():
@@ -678,21 +678,15 @@ def main():
         signal.signal(signal.SIGINT, _handle_sigterm)
 
         while _running:
-            run_once(args)
+            run_once(args)  # (healthy, report) — not needed in watch mode
             for _ in range(args.interval):
                 if not _running:
                     break
                 time.sleep(1)
     else:
-        healthy = run_once(args)
+        healthy, report = run_once(args)
 
         if args.output_json:
-            report = run_health_checks(
-                ws_host=args.ws_host,
-                ws_port=args.ws_port,
-                heartbeat_path=Path(args.heartbeat_path),
-                stale_threshold=args.stale_threshold,
-            )
             print(json.dumps({
                 "healthy": report.overall_healthy,
                 "timestamp": report.timestamp,