dangernoodle-io / breadboard / 28909844256

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feat: unified memory report (heap + bss + per-region watermarks) (#768)

- fold a bb_memreport aggregator into bb_meminfo (the memory SSOT): heap
  snapshot + bss + per-arena free/used/peak-used/alloc counters in one
  bb_memreport_snapshot_t, via bb_memreport_get/_format
- add a bb_registry-backed arena region registry (bb_memreport_register_arena/
  _deregister), duplicated host+espidf per bb_meminfo's existing convention
- add bb_mem_arena_stats_t.peak_offset (soak high-watermark, survives reset)
  and a bb_mem_arena_size() accessor needed to compute used/free per region
- switch examples/floor and examples/smoke's heap_log_tick to
  bb_memreport_get/_format (zero behavior change: neither registers an arena)
- host tests for aggregation, peak-across-reset, format truncation, and
  register NULL/duplicate rejection


Claude-Session: https://claude.ai/code/session_01VqSTc2565QtjuzrEmD5nv3

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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