feat(board): add support for Waveshare ESP32-C6 Zero

[epsilonrt]

Description of Change

This pull request adds support for the Waveshare ESP32-C6 Zero board to the Arduino-ESP32 core.

Changes include:

• Added board entry in boards.txt
• Created variants/waveshare_esp32_c6_zero with pin mapping

Test Scenarios

I have tested the following scenarios to verify the board support:

• Verified compilation and upload with Arduino IDE 2.3.6 and Espressif Arduino-ESP32 v3.3.4
• Tested basic examples successfully on the Waveshare ESP32-C6 Zero board

The following examples were compiled, uploaded, and executed successfully:

• Blink (WS2812 LED with digitalWrite)
• Blink RGB (WS2812 / RGB LED with rgbLedWrite)
• Serial CDC (USB communication)
• WiFi (WiFiClient example)
• Zigbee: Zigbee_On_Off_Light cluster tested successfully
• I2C master: control of OLED display SSD1306
• SPI master: Read/Write to SPI FRAM memory

[CLAassistant]

All committers have signed the CLA.

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Update variants/waveshare_esp32_c6_zero/pins_arduino.h": 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 epsilonrt, we appreciate your contribution to this project!

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[Copilot]

Pull request overview

This PR adds board support for the Waveshare ESP32-C6 Zero to the Arduino-ESP32 core, enabling developers to use this compact ESP32-C6 board with Arduino IDE.

Key Changes:

• Added board configuration entry in boards.txt with standard ESP32-C6 settings (4MB flash, 160MHz CPU, partition schemes, Zigbee support)
• Created pin mapping definitions in variants/waveshare_esp32_c6_zero/pins_arduino.h with comprehensive GPIO assignments

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
boards.txt	Added complete board configuration entry for waveshare_esp32_c6_zero with menu options for CPU frequency, flash settings, partition schemes, Zigbee modes, and upload speeds consistent with other ESP32-C6 boards
variants/waveshare_esp32_c6_zero/pins_arduino.h	Created pin definitions file with GPIO mappings for digital pins (D0-D21), analog pins (A0-A6), UART (TX/RX), I2C (SDA/SCL and LP I2C), SPI (SS/MOSI/MISO/SCK), and WS2812 RGB LED configuration on GPIO8

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[P-R-O-C-H-Y]

Small nitpick, but otherwise lgtm