Initial commit: CODESYS tree, integration docs, Node-RED scripts.

PLC application sources (NVL, rooms, boiler), HA/Node-RED integration guide, and NVL patch utilities.

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

codesys-tree/Device/Plc Logic/Application/PLC_PRG.st

@@ -0,0 +1,10 @@
+(* === DECLARATION === *)
+PROGRAM PLC_PRG
+VAR
+	masterBedroom: fb_switch;
+END_VAR
+
+(* === IMPLEMENTATION === *)
+// Room lights first; Boiler_PRG last (dedicated boiler_status.relay_output, not shower l_6).
+Lights_new();
+Boiler_PRG();