Revert "Add missing node tracking for config-defined nodes"

This reverts commit 9ec193ef1d.

errors.go

@@ -9,11 +9,10 @@ import (
 type PortErrorType string
 
 const (
-	ErrorTypeStartup         PortErrorType = "startup"
-	ErrorTypeNew             PortErrorType = "new"
-	ErrorTypeUnreachable     PortErrorType = "unreachable"
+	ErrorTypeStartup        PortErrorType = "startup"
+	ErrorTypeNew            PortErrorType = "new"
+	ErrorTypeUnreachable    PortErrorType = "unreachable"
 	ErrorTypeHighUtilization PortErrorType = "high_utilization"
-	ErrorTypeMissing         PortErrorType = "missing"
 )
 
 type PortError struct {
@@ -328,53 +327,3 @@ func (e *ErrorTracker) clearUnreachableLocked(node *Node) (changed bool, becameR
 	}
 	return becameReachable, becameReachable
 }
-
-func (e *ErrorTracker) SetMissing(node *Node) {
-	changed := e.setMissingLocked(node)
-	if changed {
-		e.t.NotifyUpdate()
-	}
-}
-
-func (e *ErrorTracker) setMissingLocked(node *Node) bool {
-	e.mu.Lock()
-	defer e.mu.Unlock()
-
-	key := "missing:" + node.TypeID
-
-	if _, exists := e.errors[key]; exists {
-		return false
-	}
-
-	now := time.Now()
-	e.nextID++
-	e.errors[key] = &PortError{
-		ID:          fmt.Sprintf("err-%d", e.nextID),
-		NodeTypeID:  node.TypeID,
-		NodeName:    node.DisplayName(),
-		PortName:    "",
-		ErrorType:   ErrorTypeMissing,
-		FirstSeen:   now,
-		LastUpdated: now,
-	}
-	return true
-}
-
-func (e *ErrorTracker) ClearMissing(node *Node) {
-	changed := e.clearMissingLocked(node)
-	if changed {
-		e.t.NotifyUpdate()
-	}
-}
-
-func (e *ErrorTracker) clearMissingLocked(node *Node) bool {
-	e.mu.Lock()
-	defer e.mu.Unlock()
-
-	key := "missing:" + node.TypeID
-	if _, exists := e.errors[key]; exists {
-		delete(e.errors, key)
-		return true
-	}
-	return false
-}