health-probes: clear stale results on start/restart, fast 10s probing until healthy

- Clear HealthProbe on StartStack/RestartStack so stale unhealthy state
  isn't re-applied by RefreshStatus
- Use 10s probe interval for unhealthy/new stacks (nil HealthProbe probes
  immediately on next tick), switch to normal 5m interval once healthy
- Scheduler frequency 1m → 10s to support fast probing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

controller/cmd/controller/main.go

@@ -222,7 +222,7 @@ func main() {
 	sched.Every("stack-scan", 2*time.Minute, func(ctx context.Context) error {
 		return stackMgr.ScanStacks()
 	})
-	sched.Every("health-probes", 1*time.Minute, func(ctx context.Context) error {
+	sched.Every("health-probes", 10*time.Second, func(ctx context.Context) error {
 		return stackMgr.RunHealthProbes()
 	})
 

controller/internal/stacks/healthprobe.go

@@ -33,11 +33,19 @@ func (m *Manager) RunHealthProbes() error {
 			continue
 		}
 
-		// Check if interval has elapsed since last probe
+		// Check if interval has elapsed since last probe.
+		// Fast 10s probes until healthy, then normal interval (default 5m).
+		// When HealthProbe is nil (just started/restarted), probe immediately.
 		interval := parseInterval(hc.Interval)
-		if stack.HealthProbe != nil && time.Since(stack.HealthProbe.LastCheck) < interval {
+		if stack.HealthProbe != nil {
+			effectiveInterval := interval
+			if !stack.HealthProbe.Healthy {
+				effectiveInterval = 10 * time.Second
+			}
+			if time.Since(stack.HealthProbe.LastCheck) < effectiveInterval {
 				continue
 			}
+		}
 
 		// Find the main container to probe (matching stack name)
 		containerName := findProbeContainer(name, stack.Containers)

controller/internal/stacks/manager.go

@@ -576,6 +576,15 @@ func (m *Manager) StartStack(name string) error {
 
 	m.logger.Printf("[INFO] Stack %s started successfully (took %.1fs)", name, time.Since(start).Seconds())
 	m.logPostStartStatus(name, dir, env)
+
+	// Clear stale health probe so refreshStatus won't re-apply an old unhealthy override.
+	// The next health-probes tick (≤10s) will run a fresh probe.
+	m.mu.Lock()
+	if s, ok := m.stacks[name]; ok {
+		s.HealthProbe = nil
+	}
+	m.mu.Unlock()
+
 	return m.RefreshStatus()
 }
 
@@ -624,6 +633,14 @@ func (m *Manager) RestartStack(name string) error {
 
 	m.logger.Printf("[INFO] Stack %s restarted successfully (took %.1fs)", name, time.Since(start).Seconds())
 	m.logPostStartStatus(name, dir, env)
+
+	// Clear stale health probe so refreshStatus won't re-apply an old unhealthy override.
+	m.mu.Lock()
+	if s, ok := m.stacks[name]; ok {
+		s.HealthProbe = nil
+	}
+	m.mu.Unlock()
+
 	return m.RefreshStatus()
 }