dangernoodle-io / breadboard / 29618267615

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feat: add bb_tcp_client per-instance health snapshot (#911)

- track connected/last_ok_ms/fail_count/tls_error_code per pooled instance instead of a single shared bb_transport_health "tcp" slot
- add bb_tcp_client_health_snap_t + bb_tcp_client_health_desc + bb_tcp_client_health_fill() (bb_meminfo_heap_snap pattern) as the format-agnostic wire surface
- drop bb_transport_health entirely from bb_tcp_client (both backends and CMakeLists REQUIRES) -- close() is a clean disconnect, not a transport failure, so it clears connected without bumping fail_count
- ESP-IDF backend reads tls_error_code from esp-tls's last-error handle on a TLS connect/read/write failure
- host backend gains a settable mock clock (BB_TCP_CLIENT_TESTING builds) for deterministic last_ok_ms assertions, plus a tls_error_code force hook

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