fix: CLI spec contradictions from codex AX audit

- Fix paths: relative to agent home dir, not hardcoded /home/agent
- Add worker/dream coordination: dream pauses worker to prevent file races
- Watch registration via .colony.toml (server reads agent config)
- Remove remaining old mentions API reference (use inbox instead)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/colony/src/routes.rs

@@ -228,6 +228,11 @@ pub async fn post_message(
         }
     }
 
+    // Content length limit (64KB)
+    if body.content.len() > 65_536 {
+        return Err(AppError::BadRequest("Message content exceeds 64KB limit".into()));
+    }
+
     let id = Uuid::new_v4().to_string();
     let user_id = resolve_user(&state.db, &user_param).await?;
 
@@ -347,9 +352,9 @@ pub async fn restore_message(
 
     let message = row.to_api_message();
 
-    // Broadcast as new message (restored)
+    // Broadcast as edit (not Message — dedup would ignore same ID)
     let tx = state.get_sender(&channel_id).await;
-    let _ = tx.send(WsEvent::Message(message.clone()));
+    let _ = tx.send(WsEvent::Edit(message.clone()));
 
     Ok(Json(message))
 }