dangernoodle-io / breadboard / 25201930025

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feat(bb_diag): extract panic capture from bb_log into new component (#170)

Panic capture (RTC log mirror, ESP-IDF coredump summary, boots-since
counter, /api/diag/panic GET/DELETE) was conflated into bb_log because
it shares the log-stream mirror-write path. It is a diagnostics concern,
not a logging one — splitting it unblocks clean integration with bb_info
without crossing an architectural line (bb_info → bb_log).

- new bb_diag component owns the API (bb_diag_panic_*), Kconfig
  (CONFIG_BB_DIAG_PANIC_*), routes, and host stubs
- bb_log gains bb_log_stream_set_tap(); bb_diag installs the tap from its
  early-tier init so the runtime path is functionally identical
- bb_diag also registers a bb_info extender that adds an optional
  "panic" block to /api/info when a panic log or coredump is captured,
  omitted on clean boots
- consumer impact: rename CONFIG_BB_LOG_PANIC_* → CONFIG_BB_DIAG_PANIC_*
  in sdkconfig.defaults; no C API renames in downstream code (TaipanMiner,
  snugfeather verified)

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