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>

hitachi-ir-dump.yaml

@@ -0,0 +1,29 @@
+esphome:
+  name: hitachi-ir-dump
+
+esp32:
+  board: esp32dev
+  framework:
+    type: arduino
+
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+
+logger:
+  level: DEBUG
+
+api:
+ota:
+
+remote_receiver:
+  pin:
+    number: GPIO27
+    inverted: true
+    mode:
+      input: true
+      pullup: true
+  dump: all
+  tolerance: 55%
+  filter: 250us
+  idle: 30ms