feat: adopt side-questions via prompt.btw and /btw command in Chat (fixes #1015) (#1026)

Co-authored-by: M57 <hy4ri@users.noreply.github.com>

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

@@ -163,6 +163,13 @@ object EventParser {
                 WsEvent.ReviewSummary(text, sessionId)
             }
 
+            "btw.complete" -> {
+                val taskId = payload?.get("task_id") as? String ?: ""
+                val question = payload?.get("question") as? String ?: ""
+                val text = (payload?.get("text") as? String)?.trim() ?: ""
+                WsEvent.BtwComplete(taskId, question, text, sessionId)
+            }
+
             "session.updated" -> {
                 WsEvent.SessionUpdated(payload)
             }

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

@@ -150,6 +150,18 @@ sealed class WsEvent {
         val sessionId: String? = null,
     ) : WsEvent()
 
+    /**
+     * Context-aware side-question completion event (issue #1015).
+     * Emitted when `prompt.btw` completes answering a side question.
+     * Payload: `{ task_id: "...", question: "...", text: "..." }`
+     */
+    data class BtwComplete(
+        val taskId: String = "",
+        val question: String = "",
+        val text: String = "",
+        val sessionId: String? = null,
+    ) : WsEvent()
+
     // ── Status ───────────────────────────────────────────────────────────
 
     data class StatusUpdate(

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

@@ -25,6 +25,7 @@ object WsMethods {
 
     // ── Interaction ───────────────────────────────────────────────────────
     const val PROMPT_SUBMIT = "prompt.submit"
+    const val PROMPT_BTW = "prompt.btw"
     const val CLARIFY_RESPOND = "clarify.respond"
     const val APPROVAL_RESPOND = "approval.respond"
     const val SUDO_RESPOND = "sudo.respond"