Initial commit: Hitachi RAR-6NE1 climate via ESP32/ESPHome

Reverse engineering del protocollo IR (HITACHI_AC 28 byte) del telecomando
RAR-6NE1 e custom component ESPHome bidirezionale (TX + RX) per Home Assistant.

- esphome/: custom component hitachi_rar6ne1 (climate_ir::ClimateIR) + config
- src/: firmware Arduino di cattura IR con web UI (strumento di diagnostica)
- README.md: documentazione completa (protocollo, decode, checksum, gotcha)
- Segreti esclusi dal versionamento (vedi *.example e .gitignore)
- Licenza GPL-3.0

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

esphome/components/hitachi_rar6ne1/climate.py

@@ -0,0 +1,20 @@
+import esphome.codegen as cg
+from esphome.components import climate_ir
+
+# API ESPHome recente (>= 2025.x): helper a funzione
+# climate_ir_with_receiver_schema(class) + new_climate_ir(config).
+# NB: non disponibile su 2024.12.x (li' era CLIMATE_IR_WITH_RECEIVER_SCHEMA
+# costante + register_climate_ir). Aggiornare ESPHome.
+AUTO_LOAD = ["climate_ir"]
+CODEOWNERS = ["@francescozanin"]
+
+hitachi_rar6ne1_ns = cg.esphome_ns.namespace("hitachi_rar6ne1")
+HitachiRar6ne1Climate = hitachi_rar6ne1_ns.class_(
+    "HitachiRar6ne1Climate", climate_ir.ClimateIR
+)
+
+CONFIG_SCHEMA = climate_ir.climate_ir_with_receiver_schema(HitachiRar6ne1Climate)
+
+
+async def to_code(config):
+    await climate_ir.new_climate_ir(config)