feat(patterns): align manual and auto behaviour

Unify manual/auto timing semantics for key patterns, add preset background support, and improve runtime observability while keeping the driver responsive under beat-triggered selects.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/hello.py

@@ -92,7 +92,6 @@ def broadcast_hello_udp(
     """
     ip, mask, _gw, _dns = sta.ifconfig()
     msg = pack_hello_line(sta, device_name)
-    print("hello:", msg)
 
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     try:
@@ -121,11 +120,9 @@ def broadcast_hello_udp(
     for dest_ip, dest_port in targets:
         if wdt is not None:
             wdt.feed()
-        label = "%s:%s" % (dest_ip, dest_port)
         target = (dest_ip, dest_port)
         try:
             sock.sendto(msg, target)
-            print("sent hello ->", target)
         except OSError as e:
             print("sendto failed:", e)
             continue
@@ -134,20 +131,12 @@ def broadcast_hello_udp(
         if wdt is not None:
             wdt.feed()
         try:
-            data, addr = sock.recvfrom(2048)
-            print("reply from", addr, ":", data)
+            _data, addr = sock.recvfrom(2048)
             remote_ip = addr[0]
-            if data != msg:
-                print("(warning: reply payload differs from hello; still using source IP.)")
             discovered = remote_ip
-            print("Discovered controller at", remote_ip)
             break
-        except OSError as e:
-            print("recv (no reply):", e, "via", label)
-            if dest_ip == "255.255.255.255":
-                print(
-                    "(hint: many APs drop Wi-Fi client broadcast; try wired server or AP without client isolation.)"
-                )
+        except OSError:
+            pass
 
     sock.close()
     return discovered
@@ -171,18 +160,12 @@ def discover_controller_udp(device_name="", wdt=None):
         print("hello: STA has no IP address.")
         raise SystemExit(1)
 
-    print("STA IP:", ip, "mask:", mask)
-
     discovered = broadcast_hello_udp(
         sta,
         device_name,
         wait_reply=True,
         wdt=wdt,
     )
-    if discovered:
-        print("discover done; controller =", repr(discovered))
-    else:
-        print("discover done; controller not found")
     return discovered