feat(daemon): add daemon mode with C&C and display abstraction

- Add display abstraction with swappable backends (TerminalDisplay, NullDisplay)
- Separate C&C into RX/TX topics for serial-like communication
- Add StreamController with automatic ntfy topic warmup
- Add performance monitoring for render + display stages
- Update AGENTS.md and README.md with daemon/cmd operating procedures
- Add clean/clobber tasks to mise.toml
- Add tests for display, effects controller, and controller warmup
- Fix bug where /effects reorder command was unreachable

engine/controller.py

@@ -14,6 +14,8 @@ from engine.scroll import stream
 class StreamController:
     """Controls the stream lifecycle - initializes sources and runs the stream."""
 
+    _topics_warmed = False
+
     def __init__(self, config: Config | None = None, event_bus: EventBus | None = None):
         self.config = config or get_config()
         self.event_bus = event_bus
@@ -21,6 +23,37 @@ class StreamController:
         self.ntfy: NtfyPoller | None = None
         self.ntfy_cc: NtfyPoller | None = None
 
+    @classmethod
+    def warmup_topics(cls) -> None:
+        """Warm up ntfy topics lazily (creates them if they don't exist)."""
+        if cls._topics_warmed:
+            return
+
+        import urllib.request
+
+        topics = [
+            "https://ntfy.sh/klubhaus_terminal_mainline_cc_cmd",
+            "https://ntfy.sh/klubhaus_terminal_mainline_cc_resp",
+            "https://ntfy.sh/klubhaus_terminal_mainline",
+        ]
+
+        for topic in topics:
+            try:
+                req = urllib.request.Request(
+                    topic,
+                    data=b"init",
+                    headers={
+                        "User-Agent": "mainline/0.1",
+                        "Content-Type": "text/plain",
+                    },
+                    method="POST",
+                )
+                urllib.request.urlopen(req, timeout=5)
+            except Exception:
+                pass
+
+        cls._topics_warmed = True
+
     def initialize_sources(self) -> tuple[bool, bool]:
         """Initialize microphone and ntfy sources.
 
@@ -38,7 +71,7 @@ class StreamController:
         ntfy_ok = self.ntfy.start()
 
         self.ntfy_cc = NtfyPoller(
-            self.config.ntfy_cc_topic,
+            self.config.ntfy_cc_cmd_topic,
             reconnect_delay=self.config.ntfy_reconnect_delay,
             display_secs=5,
         )
@@ -57,7 +90,7 @@ class StreamController:
 
         response = handle_effects_command(cmd)
 
-        topic_url = self.config.ntfy_cc_topic.replace("/json", "")
+        topic_url = self.config.ntfy_cc_resp_topic.replace("/json", "")
         data = response.encode("utf-8")
         req = urllib.request.Request(
             topic_url,