Add kode dot board variant

[LusimiCollado]

Description of Change

This PR adds full support for the KodeDot ESP32-S3R8 board variant to the Arduino-ESP32 core:

• New variant directory variants/kodedot/ containing:
  • pins_arduino.h with pin mappings for the 2×10 header, QSPI-LCD, SD, I²C buses, buttons, NeoPixel, JTAG, USB power pins, etc.
  • kodedot_partitions.csv defining the custom flash layout (OTA, SPIFFS, app slots).
  • custom_ota_override.cpp to override the weak verifyRollbackLater() hook, forcing OTA images to remain un-validated until explicitly approved, thus protecting against faulty updates.
• Platform configuration in platform.txt:
  • Custom upload tool esptool_py_nomerge that writes firmware at the partition offset defined in kodedot_partitions.csv without manual flags.
• Documentation updated in:
  • boards.txt (board entry for kode dot)
  • platform.txt (custom tool declaration)

With these additions, users can select kode dot, compile and upload their sketch (or OTA) directly into the correct partition, and rely on the custom_ota_override.cpp behavior to guard against bad firmware rolls.

Test scenarios

I have tested and debugged this PR on real KodeDot ESP32-S3R8 hardware using:

• Arduino-ESP32 core v3.2.0
• macOS 14.5 with Arduino IDE 2.3.2 (custom tool)
• Examples run:
  • Blink / NeoPixel (LED_BUILTIN)
  • I²C scan (external header & internal sensor bus)
  • SPI to micro-SD (SPI2_HOST)
  • QSPI-LCD fill screen @40 MHz (SPI3_HOST)
  • Firmware upload lands at correct offset via esptool_py_nomerge
  • USB-Serial enumeration (VID/PID 0x303A:0x1001)
  • Button presses & JTAG debug
  • OTA update behavior: new images remain un-validated until manual confirmation, and rollback works as intended.

All tests passed, including OTA rollback verification.

Related links

• Website: https://kode.diy/es
• GitHub org: https://github.com/kodediy
• Partition file: variants/kodedot/kodedot_partitions.csv
• Issue: N/A
• Documentation updated: boards.txt, platform.txt

[CLAassistant]

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1 out of 2 committers have signed the CLA.

✅ LusimiCollado
❌ Luis Miguel Collado Llera

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[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "kode dot board added": summary looks empty type/action looks empty the commit message "kode dot board added": summary looks empty type/action looks empty the commit message "kode dot board with pins defined": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

👋 Hello LusimiCollado, we appreciate your contribution to this project!

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[LusimiCollado]

Changes needed from developer side