dangernoodle-io / breadboard / 25197383273

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feat(bb_log): capture panic backtrace via esp coredump (#166)

- new CONFIG_BB_LOG_PANIC_COREDUMP kconfig (default off; consumers opt in by adding coredump partition)
- new public API: bb_log_panic_coredump_available + bb_log_panic_coredump_get + bb_log_panic_summary_t
- /api/diag/panic now returns task, exc_pc, exc_cause, backtrace[] when coredump available
- bb_log_panic_clear also erases the coredump image
- adds coredump partition + sdkconfig flags to all 4 smoke esp-idf envs
- documents partition requirement for downstream consumers
- CMakeLists.txt uses idf_component_get_property + target_include_directories to wire espcoredump include paths; PRIV_REQUIRES alone was insufficient in PlatformIO's IDF integration
- xtensa targets populate bt_addrs from exc_bt_info.bt/depth; riscv targets set bt_count=0 (no on-device backtrace)

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

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