feat(matrix mcp): add resolve_invite tool to accept or reject pending invites

hive-matrix-mcp/src/protocol.rs

@@ -81,6 +81,13 @@ pub enum DaemonRequest {
     #[serde(rename = "join_room")]
     JoinRoom { room: String },
 
+    /// Resolve a pending invite to `room` (id or alias) by either
+    /// accepting it (join) or rejecting it (decline + leave). For rooms
+    /// you were *invited* to; `join_room` is the path for joining a
+    /// public room you weren't invited to.
+    #[serde(rename = "resolve_invite")]
+    ResolveInvite { room: String, action: InviteAction },
+
     /// Invite `user_id` (`@user:server`) to `room` (id or alias). The
     /// calling agent must already be a member with a high enough power
     /// level to invite. Idempotent-ish: inviting an already-joined or
@@ -110,6 +117,18 @@ pub enum DaemonRequest {
     Ping,
 }
 
+/// Whether to accept or reject a pending invite in
+/// [`DaemonRequest::ResolveInvite`]. Serialises as `"accept"` /
+/// `"reject"` on the wire.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case")]
+pub enum InviteAction {
+    /// Accept the invite — join the room (same effect as `join_room`).
+    Accept,
+    /// Reject the invite — decline it and leave the room.
+    Reject,
+}
+
 /// One entry in the [`DaemonRequest::UnreadSummary`] response payload.
 #[derive(Debug, Serialize, Deserialize)]
 pub struct RoomUnread {