feat(chat): support first-class /compress and /compact session compression (#1306)

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

@@ -0,0 +1,32 @@
+package com.m57.hermescontrol.data.model
+
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.JsonElement
+
+@Serializable
+data class SessionCompressResponse(
+    val status: String? = null,
+    val removed: Int? = null,
+    val before_messages: Int? = null,
+    val after_messages: Int? = null,
+    val before_tokens: Long? = null,
+    val after_tokens: Long? = null,
+    val summary: CompressionSummary? = null,
+    val compressed: Boolean? = null,
+    val lock_held: Boolean? = null,
+    val message: String? = null,
+    val messages: List<SessionMessage>? = null,
+    val usage: JsonElement? = null,
+    val info: JsonElement? = null,
+)
+
+@Serializable
+data class CompressionSummary(
+    val noop: Boolean = false,
+    val aborted: Boolean = false,
+    val refused_would_grow: Boolean? = null,
+    val fallback_used: Boolean? = null,
+    val headline: String = "",
+    val token_line: String = "",
+    val note: String? = null,
+)

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

@@ -73,7 +73,6 @@ object CommandBlocklist {
             "/image",
             "/quit",
             // TUI-only extras (meaningless outside the TUI)
-            "/compact",
             "/logs",
             "/mouse",
         )

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

@@ -16,6 +16,7 @@ object WsMethods {
     const val SESSION_TITLE = "session.title"
     const val SESSION_BRANCH = "session.branch"
     const val SESSION_BRANCH_WHOLE = "session.branch_whole"
+    const val SESSION_COMPRESS = "session.compress"
 
     /** Replay recorded events newer than client's last-seen seq for a session. */
     const val SESSION_EVENTS_SINCE = "session.events.since"