Merge branch 'main' into dev

Bring main's maintainer-curated work (cookbook scheduler, calendar rendering/sync, settings polish, agent debug loop) into dev so dev is a superset of main (resolves the dev/main drift, #2543).

src/tool_schemas.py

@@ -787,6 +787,21 @@ FUNCTION_TOOL_SCHEMAS = [
             }
         }
     },
+    {
+        "type": "function",
+        "function": {
+            "name": "tail_serve_output",
+            "description": "Read the last N lines of a cookbook serve/download task's tmux pane. Use ONLY in this exact sequence: (1) the user asked to serve a model, (2) you launched it via serve_model, (3) list_served_models reports the NEW task as crashed/error, (4) call tail_serve_output on the new sessionId to find the root cause, (5) call serve_model again with adjusted flags. DO NOT call this on old stopped/completed download tasks — they are historical and won't tell you anything about the current attempt. DO NOT investigate past failures before launching; the environment may have changed since.",
+            "parameters": {
+                "type": "object",
+                "properties": {
+                    "session_id": {"type": "string", "description": "Tmux session id from list_served_models (e.g. 'serve-abc12345', 'cookbook-a1b2c3d4')."},
+                    "tail": {"type": "integer", "description": "How many lines of pane scrollback to fetch (default 300, max 4000). Bump this if the error in the visible tail references an earlier line ('see root cause above')."},
+                },
+                "required": ["session_id"]
+            }
+        }
+    },
     {
         "type": "function",
         "function": {