feat(sdcard): add validation diagrams and SD Card tests

[JakubAndrysek]

This pull request adds new hardware validation diagrams and a basic test for SD card SPI connectivity across various ESP32 board variants. The main focus is to ensure compatibility and proper wiring for SD card modules on different ESP32 development boards.

Hardware validation diagrams:

• Added diagram.esp32.json for ESP32 DevKitC V4, showing connections for two microSD cards.
• Added diagram.esp32c3.json for ESP32-C3 DevKitM-1, illustrating wiring for one microSD card.
• Added diagram.esp32c6.json for ESP32-C6 DevKitC-1, including connections for two microSD cards.
• Added diagram.esp32s2.json for ESP32-S2 DevKitM-1, detailing wiring for two microSD cards.
• Added diagram.esp32s3.json for ESP32-S3 DevKitC-1, showing two microSD cards connected.

Testing:

• Added a simple SPI test function test_spi in test_sdcard.py to check SD card communication, using Unity test output with a specified timeout.

[github-actions]

Warnings

⚠️

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

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[github-actions]

Test Results

 90 files   90 suites   27m 51s ⏱️
 56 tests  55 ✅ 0 💤 0 ❌ 1 🔥
605 runs  598 ✅ 0 💤 0 ❌ 7 🔥

For more details on these errors, see this check.

Results for commit fcae8c8.

♻️ This comment has been updated with latest results.

[Copilot]

Pull request overview

This PR adds comprehensive SD card validation infrastructure for multiple ESP32 board variants, including hardware wiring diagrams and extensive functional tests for SD card SPI connectivity.

Key Changes:

• Adds hardware validation diagrams for 5 ESP32 variants (ESP32, ESP32-C3, ESP32-C6, ESP32-S2, ESP32-S3) with microSD card wiring specifications
• Implements 10 comprehensive test cases covering basic operations, file I/O, directory management, and limits testing
• Creates a flexible test framework supporting multiple SPI configurations per board

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
tests/validation/sdcard/test_sdcard.py	Python test wrapper that invokes Unity test framework with 280-second timeout
tests/validation/sdcard/sdcard.ino	Main Arduino test suite with SPITestConfig class and 10 comprehensive SD card test functions
tests/validation/sdcard/diagram.esp32.json	Wokwi hardware diagram for ESP32 DevKit C V4 with two microSD cards on separate SPI buses
tests/validation/sdcard/diagram.esp32s3.json	Wokwi hardware diagram for ESP32-S3 DevKitC-1 with two microSD cards
tests/validation/sdcard/diagram.esp32s2.json	Wokwi hardware diagram for ESP32-S2 DevKitM-1 with two microSD cards (contains wiring error)
tests/validation/sdcard/diagram.esp32c6.json	Wokwi hardware diagram for ESP32-C6 DevKitC-1 with two microSD cards sharing SPI bus
tests/validation/sdcard/diagram.esp32c3.json	Wokwi hardware diagram for ESP32-C3 DevKitM-1 with single microSD card

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