feat(#2479): add from/until event-id cursors to read_room

hive-matrix-mcp/src/protocol.rs

@@ -114,11 +114,21 @@ pub enum DaemonOp {
     #[serde(rename = "list_room_members")]
     ListRoomMembers { room: String },
 
-    /// Read the last `limit` events from a room's timeline. Caller
-    /// gets each event's id, sender, `server_ts`, type, and body (best-
-    /// effort plain-text extraction from `m.text` / `m.notice` etc.).
+    /// Read events from a room's timeline. Caller gets each event's id,
+    /// sender, `server_ts`, type, and body (best-effort plain-text extraction
+    /// from `m.text` / `m.notice` etc.). With neither cursor, returns the last
+    /// `limit` events (newest-first). `from` / `until` anchor at an event id
+    /// (mutually exclusive): `until` reads the anchor + `limit-1` events before
+    /// it (into the past); `from` reads the anchor + `limit-1` events after it.
     #[serde(rename = "read_room")]
-    ReadRoom { room: String, limit: Option<usize> },
+    ReadRoom {
+        room: String,
+        limit: Option<usize>,
+        #[serde(default)]
+        from: Option<String>,
+        #[serde(default)]
+        until: Option<String>,
+    },
 
     /// Download the media attachment carried by `event_id` in `room`
     /// and write it to a local file (`dest_path`, or a temp file named