dangernoodle-io / breadboard / 25266487312

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feat(bb_display): arduino ssd1306 backend (B1-143) (#185)

arduino sibling of the esp-idf ssd1306 backend (#182). direct
wire i2c — no adafruit deps. probe via wire.endtransmission()
ack at 0x3c (override via -DBB_DISPLAY_SSD1306_I2C_ADDR).
framebuffer is 1bpp, rgb565 → mono via non-zero threshold
(matches the esp-idf backend exactly).

inline ssd1306 init sequence so we don't drag in adafruit_gfx
just for register writes — save ~5-10 kb of flash. supports
128x32 (default) and 128x64 via -DBB_DISPLAY_SSD1306_HEIGHT.

r4_wifis3 smoke env wires it; the registry walker now considers
ssd1306 alongside ili9341. no smoke_app.c change needed — the
generic bb_display_init() flow handles backend selection.

flash on r4 grew 70.4 → 76.6 kb (+6.2 kb). 371 host tests pass;
all six smoke envs build green.

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