dangernoodle-io / breadboard / 29161347671

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feat: migrate boot-count to bb_system boot-health (#816)

- adds bb_system_boot_count_get/_increment/_reset + BB_SYSTEM_BOOT_FAIL_THRESHOLD,
  co-located with the reboot-reason record under the bb_reboot NVS namespace
  (ESP-IDF: via bb_nv's generic get_u8/set_u8; host/arduino: in-memory,
  fully round-trippable for host tests, unlike the prior ESP-only bb_nv api)
- switches bb_ota_validator, bb_wifi, wifi_reconn off bb_nv_config_*_boot_count
  onto the new bb_system api; drops bb_nv from bb_ota_validator's CMakeLists
  (boot-count was its only bb_nv use); bb_wifi keeps bb_nv (pending-creds,
  hostname)
- deletes the bb_nv boot-count functions + BB_NV_CONFIG_BOOT_FAIL_THRESHOLD
- adds bb_system host tests for get/increment/reset/saturate/threshold
- adds BB_REBOOT_KEY_BOOT_CNT to the bb_nv_keys.h SSOT registry alongside its
  BB_REBOOT_KEY_LAST/_HISTORY siblings, replacing the local
  BB_SYSTEM_BOOT_CNT_NVS_KEY define
- migration is non-preserving-but-safe: the old bb_cfg/boot_cnt value is
  orphaned (not carried forward), and the counter resets to 0 on a
  pre-migration-to-post-migration OTA; safe because the counter is zeroed
  on every successful WiFi connect and a device must have connected
  recently to fetch the OTA, so the reset only discards partial
  fail-progress on an already-healthy device

part of the bb_nv dissolution epic (B1-708)


Claude-Session: https://claude.ai/code/session_01VQXiyqFjcMpPPpef5TL9gA

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

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