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refactor: drop non-composable led/button/display exercises from examples/smoke (#1137)

- smoke is the codegen-composed firmware; a component belongs there only
  if it carries a `// bbtool:init` marker matched by a smoke wire-board
- led/button components carried no marker, so drop both the handwired
  open/attach call sites in smoke_app.c and the bbtool.toml manifest
  entries (8 components); they remain host-compiled via [capability.core]
- drop the handwired bb_display_init()/bb_display_show_splash() splash and
  the font showcase loop; bb_display_register_info() health registration
  stays, it never requires bb_display_init()
- the showcase loop was NOT dead code: bb_display.h defaults
  BB_DISPLAY_FONT_5X8/6X12 to 1 when the Kconfig is unset, so its guard
  held on r4_wifis3 (-DBB_WIFI_BACKEND_R4), where the loop never fell
  through to wifi/http bring-up; it goes under the non-composable rule,
  not because it was unreachable
- drop the led/button build_src_filter lines and matching -I entries from
  [arduino_base] in platformio.ini; those arduino/avr backends lose their
  only non-host compile gate, which is accepted
- reword the smoke README's elecrow-p4-hmi7 row so it no longer claims a
  runtime-exercised display


Claude-Session: https://claude.ai/code/session_0119nuE2NZME9y2aYEVJTPB5

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

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