dangernoodle-io / breadboard / 28473894904

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refactor(bb_pub): move static identity from info topic to meta topic (TA-505) (#614)

- move version, board, chip_model, mac, flash_size, app_size,
  dram_static_bytes, reset_reason, boot_epoch_s, time_source,
  rtc_used, rtc_total from bb_pub_info (info topic) to
  bb_pub_telemetry (meta topic)
- drop rtc_free field entirely (derived: rtc_total - rtc_used)
- slim bb_info_snap_t to dynamic runtime metrics only: heap internal
  free/total/largest_block/min_free, psram free/total, wdt_resets,
  ota_validated, ota_ready (gated), time_valid, bb_mem_out/peak/fail,
  ts_ms
- extend meta_snap_t with 12 identity fields; numerics before char
  arrays to minimise padding; sizeof(meta_snap_t) ~320 bytes on esp32
  (32-bit) fits within CONFIG_BB_PUB_TELEM_SNAP_MAX 512
- add bb_board, bb_ntp, bb_system to bb_pub_telemetry PRIV_REQUIRES
- drop bb_system from bb_pub_info REQUIRES (no longer used)
- replace 21 identity-field presence tests in test_bb_pub_info with
  13 absence tests confirming fields moved out of info
- add 16 meta identity tests via gather/serialize test hooks in
  test_bb_pub_telemetry
- update fidelity test: assert heap_internal_free (not version)
  present in info since version moved to meta


Claude-Session: https://claude.ai/code/session_0139joCQWAyff4eATuKyZH4f

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

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