Add orchestrators for remaining FastLED CI platforms

[zackees]

Summary

FastLED CI builds for ~40+ board targets. We've migrated all boards with existing fbuild orchestrators (atmelavr, espressif32, teensy Cortex-M7) but several platform families still require PlatformIO because fbuild lacks orchestrators for them.

Platforms needing orchestrators

Platform	Boards	Notes
atmelmegaavr	ATtiny1604, ATtiny1616, nano_every	Modern AVR (different from classic atmelavr)
ststm32	bluepill (F103C8), maple_mini (F103CB), blackpill (F411CE), nucleo_f429zi, nucleo_f439zi, giga_r1_m7 (H747XI)	ARM Cortex-M STM32 family
atmelsam	adafruit_feather_m0 (SAMD21), zeroUSB (SAMD21), adafruit_feather_m4 (SAMD51), adafruit_grand_central_m4 (SAMD51)	ARM Cortex-M0+/M4F
raspberrypi	rpipico (RP2040), rpipico2 (RP2350), sparkfun_xrp_controller (RP2350B)	Uses maxgerhardt/platform-raspberrypi + earlephilhower/arduino-pico
nordicnrf52	nrf52840_dk, adafruit_feather_nrf52840_sense, xiaoblesense variants	Nordic nRF52 family
espressif8266	esp01 (ESP8266)	Legacy but still in CI
renesas-ra	uno_r4_wifi	Arduino UNO R4 WiFi
apollo3blue	SparkFun_RedBoard_Artemis_ATP, SparkFun_Thing_Plus_expLoRaBLE	Ambiq Apollo3
siliconlabsefm32	sparkfun_thingplusmatter (MGM240S)	EFR32MG24, ARM Cortex-M33

Also

• atmega8a (atmelavr with MiniCore framework) — was previously noted as broken due to core path + board name mapping issues. Would be nice to fix.
• Teensy 3.x/LC (teensy30–36, teensylc) — Cortex-M4, currently only Cortex-M7 is supported by TeensyOrchestrator

Currently migrated (19 boards)

• atmelavr: uno, attiny85, attiny88, attiny4313, leonardo
• espressif32: esp32dev, esp32s3, esp32c3, esp32c6, esp32c2, esp32c5, esp32p4, esp32s2, esp32h2, upesy_wroom, seeed_xiao_esp32s3
• teensy (M7): teensy40, teensy41

Priority suggestion

STM32 and RP2040/RP2350 would unlock the most builds. SAMD and nRF52 are also high value.

[zackees]

All platforms implemented and passing CI ✅

Every platform listed in this issue now has a working native orchestrator with CI coverage:

Platform	Orchestrator	Boards passing CI
atmelmegaavr	avr::AvrPlatformSupport	ATtiny1604, ATtiny1616, Nano Every
ststm32	stm32::Stm32PlatformSupport	BluePill F103C8, BlackPill F411CE, Nucleo F429ZI/F439ZI, Giga R1 M7, TinySTM103TB, STM32F103CB, STM32H747XI
atmelsam	sam::SamPlatformSupport	SAMD21, SAMD21 Zero, SAMD51J, SAMD51P, Arduino Due
raspberrypi	rp2040::Rp2040PlatformSupport	RPi Pico, Pico 2, RP2040, RP2350
nordicnrf52	nrf52::Nrf52PlatformSupport	nRF52840 DK, Adafruit Feather NRF52840 Sense
espressif8266	esp8266::Esp8266PlatformSupport	ESP8266
renesas-ra	renesas::RenesasPlatformSupport	UNO R4 WiFi
apollo3blue	apollo3::Apollo3PlatformSupport	RedBoard Artemis, expLoRaBLE
siliconlabsefm32	silabs::SilabsPlatformSupport	SparkFun Thing Plus Matter (MGM240)

Also fixed:

• atmega8a (atmelavr + MiniCore) — ATmega8, ATmega8A both passing ✅
• Teensy 3.x/LC — Teensy 3.0, 3.1, 3.2, 3.5, 3.6, LC all passing ✅

All 69 board CI workflows are green. Closing as complete.