feat(#538): wire tool.progress/generating + subagent.* events into chat (#567)

* feat(#538): wire tool.progress/generating + subagent.* events into chat

* fix(#538): remove subagent indicator on subagent.complete so it doesn't linger

* style(#538): drop dead Elvis on non-nullable event.text in onMessageComplete

---------

Co-authored-by: M57 <m57@hermes-control.app>

app/src/main/java/com/m57/hermescontrol/data/ws/EventParser.kt

@@ -90,6 +90,21 @@ object EventParser {
                 WsEvent.ToolComplete(name, payload, sessionId)
             }
 
+            "tool.progress" -> {
+                val name = payload?.get("name") as? String
+                val preview = payload?.get("preview") as? String
+                WsEvent.ToolProgress(name, preview, sessionId)
+            }
+
+            "tool.generating" -> {
+                val name = payload?.get("name") as? String
+                WsEvent.ToolGenerating(name, sessionId)
+            }
+
+            "subagent.spawn_requested", "subagent.start", "subagent.progress", "subagent.complete" -> {
+                WsEvent.SubagentEvent(eventType, payload, sessionId)
+            }
+
             "tool.output_risk" -> {
                 val toolId = payload?.get("tool_id") as? String ?: ""
                 val name = payload?.get("name") as? String ?: ""

app/src/main/java/com/m57/hermescontrol/data/ws/WsEvent.kt

@@ -79,6 +79,41 @@ sealed class WsEvent {
         val sessionId: String? = null,
     ) : WsEvent()
 
+    /**
+     * Live tool execution progress with optional preview content.
+     *
+     * Events: `tool.progress`
+     * Payload: `{ name?: string, preview?: string }`
+     */
+    data class ToolProgress(
+        val name: String? = null,
+        val preview: String? = null,
+        val sessionId: String? = null,
+    ) : WsEvent()
+
+    /**
+     * Tool generation active state.
+     *
+     * Events: `tool.generating`
+     * Payload: `{ name?: string }`
+     */
+    data class ToolGenerating(
+        val name: String? = null,
+        val sessionId: String? = null,
+    ) : WsEvent()
+
+    /**
+     * Subagent execution and delegation events.
+     *
+     * Events: `subagent.spawn_requested`, `subagent.start`, `subagent.progress`, `subagent.complete`
+     * Payload includes goal, task_index, task_count, subagent_id, child_session_id, text, status, summary, duration_seconds.
+     */
+    data class SubagentEvent(
+        val type: String,
+        val payload: Map<String, Any?>?,
+        val sessionId: String? = null,
+    ) : WsEvent()
+
     // ── Interactive ──────────────────────────────────────────────────────
 
     data class ClarifyRequest(