dangernoodle-io / breadboard / 25265856688

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feat(bb_display): ili9341 spi tft backend with rddid probe (B1-140) (#183)

new bb_display_ili9341 component implementing the
bb_display_backend_t vtable for ili9341 240x320 spi tfts (most
common arduino+tft combo). lands on top of espressif/esp_lcd_ili9341
managed component. landscape orientation via madctl rotation —
backend reports 320x240.

probe() reads spi register 0xd3 (rddid4) and matches the 0x9341
chip id, accepting three byte-layout variants seen in clones.
PIN_LCD_MISO must be wired in the consumer's bb_hw board header
(otherwise probe returns BB_ERR_INVALID_STATE and the registry
walker skips us). this is the first probe-capable backend in BB
that's been validated against real silicon — the seeed 2.8" tft
touch shield v1.0 (5a12) wires miso for the touch chip and
exercises the full path.

kconfig: spi host (2 or 3), pixel clock (default 40 mhz),
backlight active-low gate, autoregister gate.

blit byte-swaps rgb565 through a 512-pixel bounce buffer; clear
is line-buffered. no smoke env wires this today (no consumer
board has the right pin defines + an attached panel) — added to
EXCLUDE_COMPONENTS on every smoke target so the managed-component
download doesn't drag in for builds that don't link it. real
validation lands with B1-139's r4 minima auto-detect demo.

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