Remove unused declarations from linter warnings

- Remove interruptAndMute() from ChatInterruptController
- Remove isBackgrounded property from ChatLifecycleController
- Remove isFocusAvailable() from ChatRobotLifecycleHandler
- Remove unused fields robotStateValues and availablePlaceholders from EventRule
- Keep enum constants and interface methods (may be needed for Pepper/future use)

Author: studerus

app/src/main/java/ch/fhnw/pepper_realtime/controller/ChatInterruptController.kt

@@ -82,10 +82,5 @@ class ChatInterruptController @Inject constructor(
             Log.e(TAG, "Error during interruptSpeech", e)
         }
     }
-
-    fun interruptAndMute() {
-        interruptSpeech()
-        audioInputController.mute()
-    }
 }
 

app/src/main/java/ch/fhnw/pepper_realtime/controller/ChatLifecycleController.kt

@@ -58,12 +58,6 @@ class ChatLifecycleController @Inject constructor(
         }
     }
 
-    /**
-     * Check if app was stopped by going to background
-     */
-    val isBackgrounded: Boolean
-        get() = wasStoppedByBackground
-
     private fun pauseActiveServices() {
         audioInputController.cleanupForRestart()
 

app/src/main/java/ch/fhnw/pepper_realtime/controller/ChatRobotLifecycleHandler.kt

@@ -242,10 +242,6 @@ class ChatRobotLifecycleHandler(
         activity.runOnUiThread { viewModel.setStatusText(error) }
     }
 
-    fun isFocusAvailable(): Boolean {
-        return true // Placeholder until RobotFocusManager is exposed via ChatActivity
-    }
-
     private val timeFormat = SimpleDateFormat("HH:mm:ss", Locale.getDefault())
 
     private fun initializeDashboardListener() {

app/src/main/java/ch/fhnw/pepper_realtime/data/EventRule.kt

@@ -50,13 +50,8 @@ data class RuleCondition(
             "trackAge" to FieldInfo("Track Age (ms)", FieldType.NUMBER),
             "peopleCount" to FieldInfo("People Count", FieldType.NUMBER),
             "robotState" to FieldInfo("Robot State", FieldType.STRING)
+            // Note: robotState accepts values: IDLE, LISTENING, THINKING, SPEAKING
         )
-        
-        /**
-         * Possible values for robotState field.
-         * IDLE, LISTENING, THINKING, SPEAKING
-         */
-        val robotStateValues = listOf("IDLE", "LISTENING", "THINKING", "SPEAKING")
     }
 }
 
@@ -109,24 +104,12 @@ data class EventRule(
     val cooldownMs: Long = 5000L
 ) {
     companion object {
-        /**
-         * Available placeholders for templates.
-         * Note: Some placeholders (age, gender, emotion, etc.) are no longer available
-         * as the head-based perception system doesn't provide this data.
-         */
-        val availablePlaceholders = listOf(
-            "{personName}" to "Name of the recognized person",
-            "{distance}" to "Distance in meters (e.g., '1.2m')",
-            "{isLooking}" to "Whether person is looking at robot (true/false)",
-            "{gazeDuration}" to "How long looking at robot (e.g., '5s')",
-            "{trackAge}" to "How long person has been tracked (e.g., '30s')",
-            "{peopleCount}" to "Number of people detected",
-            "{robotState}" to "Robot state (LISTENING, SPEAKING, THINKING, IDLE)",
-            "{timestamp}" to "Current time"
-        )
-
         /**
          * Default rules that ship with the app.
+         * 
+         * Available template placeholders:
+         * {personName}, {distance}, {isLooking}, {gazeDuration},
+         * {trackAge}, {peopleCount}, {robotState}, {timestamp}
          */
         val defaultRules = listOf(
             EventRule(