Firmware v0.1

First firmware release. Runs the lamp on real hardware: Wi-Fi, web interface,
PIO LED driver and buttons.

Six programs — demo, live moon phase, real moon gated on the moon's actual
altitude, colour cycle, night light, manual. Sun and moon positions are computed
on the device; Wi-Fi is used only to set the clock over NTP. No cloud service,
no API key.

Setup from a phone. On first boot the Pico opens its own network and serves
a setup form. After that there is a web interface for program, brightness,
earthshine, ring geometry and output mode.

Install: unzip, then python tools/provision.py --port COM5.
Needs a Raspberry Pi Pico W with MicroPython, an SK6812 RGBW strip and a
74AHCT125 level shifter. Wiring and the full parameter list are in README.md.

Known limitation: temporal dithering over DMA ships off by default and has not
been field-tested. Full notes in CHANGELOG.md.