feat(subagents): live active subagents roster and transcript tail (#1089) (#1098)

app/src/main/java/com/m57/hermescontrol/data/model/SubagentModels.kt

@@ -0,0 +1,52 @@
+package com.m57.hermescontrol.data.model
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.JsonElement
+
+/**
+ * Item returned in the [SubagentListResponse] from `subagent.list` (issue #1089).
+ */
+@Serializable
+data class SubagentListItem(
+    @SerialName("subagent_id") val subagentId: String = "",
+    val goal: String? = null,
+    val status: String? = null,
+    val model: String? = null,
+    @SerialName("elapsed_seconds") val elapsedSeconds: Double? = null,
+    @SerialName("started_at") val startedAt: Double? = null,
+    @SerialName("parent_id") val parentId: String? = null,
+    val depth: Int? = null,
+    @SerialName("delegation_id") val delegationId: String? = null,
+    @SerialName("tool_count") val toolCount: Int? = null,
+    @SerialName("last_tool") val lastTool: String? = null,
+    @SerialName("accepting_steer") val acceptingSteer: Boolean? = null,
+)
+
+/**
+ * Response returned from `subagent.list` (issue #1089).
+ */
+@Serializable
+data class SubagentListResponse(
+    val subagents: List<SubagentListItem> = emptyList(),
+    val delegations: List<JsonElement> = emptyList(),
+)
+
+/**
+ * Response returned from `subagent.tail` (issue #1089).
+ *
+ * Backend returns either `text` (desktop/TUI gateway) or `tail` (contract).
+ * [content] returns the authoritative transcript text from whichever field is present.
+ */
+@Serializable
+data class SubagentTailResponse(
+    @SerialName("subagent_id") val subagentId: String = "",
+    val tail: String? = null,
+    val text: String? = null,
+    val available: Boolean? = null,
+    val truncated: Boolean? = null,
+    @SerialName("bytes_read") val bytesRead: Long? = null,
+) {
+    /** Returns authoritative transcript text across backend schema variants. */
+    fun content(): String = text ?: tail ?: ""
+}