feat(#1681): add matrix send_file + send_file_dm tools

hive-matrix-mcp/src/protocol.rs

@@ -27,6 +27,26 @@ pub enum DaemonRequest {
     #[serde(rename = "send_dm")]
     SendDm { user_id: String, body: String },
 
+    /// Upload a local file and post it as an attachment to `room`
+    /// (id or alias). `caption`, when set, is sent as a follow-up
+    /// text message in the same room.
+    #[serde(rename = "send_file")]
+    SendFile {
+        room: String,
+        path: String,
+        caption: Option<String>,
+    },
+
+    /// Open (or reuse) a DM with `user_id` and post a local file as an
+    /// attachment. `caption`, when set, is sent as a follow-up text
+    /// message in the DM.
+    #[serde(rename = "send_file_dm")]
+    SendFileDm {
+        user_id: String,
+        path: String,
+        caption: Option<String>,
+    },
+
     /// React to a specific event with an emoji `key`. Matrix-spec
     /// `m.reaction` annotation.
     #[serde(rename = "send_reaction")]