refactor: 3-module pd architecture + viz non-blocking fix

- midi-in.pd: netreceive -> route -> unpack -> pitch/velocity outlets
- audio-out.pd: inlet~ -> dac~ abstraction
- synth.pd: consumer patch wiring midi-in -> voice -> audio-out
- led-matrix-viz.py: router socket non-blocking, registered with poller
- pd.rego: skip outlet/abstraction false positives in validation

scripts/led-matrix-viz.py

@@ -26,9 +26,10 @@ def main():
     sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
     sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
     sock.bind(("0.0.0.0", VIZ_PORT))
+    sock.setblocking(False)
 
     router = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-    router.settimeout(2)
+    router.setblocking(False)
     router.connect(ROUTER_SOCK)
     packer = msgpack.Packer()
 
@@ -38,9 +39,11 @@ def main():
     msg_id = 0
     frame_interval = 1.0 / FPS
     next_frame = time.monotonic()
+    router_buf = b""
 
     poller = select.poll()
     poller.register(sock, select.POLLIN)
+    poller.register(router, select.POLLIN)
 
     while True:
         timeout = max(0, int((next_frame - time.monotonic()) * 1000))
@@ -70,6 +73,12 @@ def main():
                 except BlockingIOError:
                     pass
 
+            if fd == router.fileno() and flags & select.POLLIN:
+                try:
+                    router_buf += router.recv(4096)
+                except BlockingIOError:
+                    pass
+
         if time.monotonic() >= next_frame:
             next_frame = time.monotonic() + frame_interval
 
@@ -92,16 +101,8 @@ def main():
                 req = packer.pack([0, msg_id, "draw_frame", params])
                 try:
                     router.sendall(req)
-                    router.settimeout(0.3)
-                    router.recv(128)
-                    router.settimeout(2)
-                except socket.timeout:
+                except BlockingIOError:
                     pass
-                except OSError:
-                    router.close()
-                    router = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
-                    router.settimeout(2)
-                    router.connect(ROUTER_SOCK)
                 last_frame = frame
 
 if __name__ == "__main__":