feat: persist sgclaw browser conversations

src/pipe/protocol.rs

@@ -14,6 +14,14 @@ pub enum BrowserMessage {
     },
     SubmitTask {
         instruction: String,
+        #[serde(default)]
+        conversation_id: String,
+        #[serde(default)]
+        messages: Vec<ConversationMessage>,
+        #[serde(default)]
+        page_url: String,
+        #[serde(default)]
+        page_title: String,
     },
     Response {
         seq: u64,
@@ -26,6 +34,12 @@ pub enum BrowserMessage {
     },
 }
 
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct ConversationMessage {
+    pub role: String,
+    pub content: String,
+}
+
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "snake_case")]
 pub enum AgentMessage {