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feat(smoke): fold cc3000 path into smoke example as uno_cc3000 (#160)

Retire examples/arduino-uno-cc3000/ entirely. Add a uno_cc3000 env to
examples/smoke/platformio.ini that runs the same portable smoke_app.c
on classic AVR Uno + Adafruit CC3000 shield. One codebase, one example
dir, one entry shim — backend selection via -DBB_WIFI_BACKEND_CC3000
and build_src_filter pulling bb_wifi_cc3000.cpp.

Constraint: uno_cc3000 stays AVR-only because Adafruit_CC3000 uses
deprecated SPI APIs (setDataMode/setBitOrder/setClockDivider) absent
from modern Arduino cores (renesas-ra et al.). Folding CC3000 onto a
Cortex-M host (R4 Minima) requires a forked or replacement library.

Add `rm -rf examples/smoke/.pio/platform` to the smoke-r4_wifis3 and
smoke-uno_cc3000 make targets — without it, sequential local runs see
build_src_filter cross-pollute platform/arduino/*.cpp.o between AVR
and ARM toolchains. CI is unaffected (one env per runner).

Update CI smoke matrix and Makefile aggregate target.

Local builds clean: r4_wifis3 (61KB flash), uno_cc3000 (24KB flash /
1254B SRAM, 61% / 74% on Uno), elecrow-p4-hmi7, esp32-wroom-32. Host
tests 352/352.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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