dangernoodle-io / breadboard / 28143564083

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feat: bb_heap_arena reserved contiguous heap arena + custom mbedTLS allocator (#548)

- add components/bb_heap_arena with Kconfig (BB_HEAP_ARENA_BYTES, BB_HEAP_ARENA_AUTOREGISTER)
- add platform/espidf/bb_heap_arena: multi_heap arena + mbedtls_platform_set_calloc_free install
- add platform/host/bb_heap_arena: bump-allocator stub for host testing
- add test/test_host/test_heap_arena.c: 9 routing/fallback/null-safety tests (2539/2539 pass)
- wire bb_heap_arena into platformio.ini (build flags + component list) and native_scaffold.py
- add README component table row


Claude-Session: https://claude.ai/code/session_01Mr5fHxEQnf4h2McLGPcKo3

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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