Add a thin dual-SSD1683 driver (src/epd.rs, ported from GxEPD2's
GxEPD2_579_GDEY0579T93) for the 792x272 e-paper panel: reset/init,
RAM addressing, the split-and-mirror full-frame blit across the
master/slave seam at x=396, and full-refresh waveform. Frame
implements embedded-graphics' DrawTarget.
Replace the Spike 1 blink harness in main.rs with the Spike 2 test:
SPI at 4 MHz over SCK 12 / DIN 11 / CS 7 / DC 6 / RST 5 / BUSY 4,
alternating normal/inverted frames with a seam-straddling circle,
"Typoena", and the build tag. Verified on hardware 2026-07-04.
Generated from esp-rs/esp-idf-template for the ESP32-S3 std target.
src/main.rs toggles GPIO 2 every 500 ms and logs `blink N` over USB-
serial — the minimum bring-up surface called out in
docs/v0.1-mvp-technical.md (Spike 1: confirm toolchain, flash, and basic
GPIO). edition=2024 with rust-version=1.85.
No editor/render/git/usb/fs modules yet; those land per the spike
methodology when later spikes need them.
