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refactor(bb_hw): remove bundled board headers + FIRMWARE_BOARD_* dispatch (B1-91) (#115)

bb_hw is a portable component and should not own consumer hardware
definitions. Examples (and any other consumer) own their own board
headers via the existing BB_HW_BOARD_HEADER mechanism — same pattern
TaipanMiner already uses.

- bb_hw.h reduced to a single `#include BB_HW_BOARD_HEADER` with #error
  fallback; FIRMWARE_BOARD_* fallback dispatch removed entirely
- bundled headers moved to their owning examples:
  - components/bb_hw/include/boards/elecrow_p4_hmi7.h →
    examples/elecrow-p4-hmi7/board/elecrow_p4_hmi7.h
  - components/bb_hw/include/boards/esp32_wroom_32.h →
    examples/esp32-wroom-32/board/esp32_wroom_32.h
- each example's CMakeLists injects -I<board-dir> globally and sets
  BB_HW_BOARD_HEADER, mirroring TaipanMiner CMakeLists.txt:18-21
- CLAUDE.md bb_hw section updated; bundled-fallback discussion removed

No external-consumer impact: TaipanMiner uses BB_HW_BOARD_HEADER
exclusively (verified) and snugfeather follows the same pattern.

Verified: both example builds SUCCESS, host tests 295/295.

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

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