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feat: add bb_tcp_client TCP/TLS stream transport (#839)

- new components/bb_tcp_client: handle-based, zero-heap (static
  BB_TCP_CLIENT_MAX_INSTANCES pool) connected TCP/TLS stream client, the
  stream peer to bb_udp_client
- dumb transport: no reconnect/backoff/keepalive — that lives in the
  consumer's FSM (e.g. bb_fsm driving a stratum client, TA-560)
- flat per-platform-TU backends: espidf (esp_transport/esp-tls, real DNS +
  TLS handshake), host (hermetic fake, BB_TCP_CLIENT_TESTING hooks), arduino
  (BB_ERR_UNSUPPORTED stub, mirrors bb_http_client's precedent)
- self-registers one AUTHORITATIVE bb_transport_health "tcp" slot; reports
  ok=true/false on connect and on a hard read/write error, never on a plain
  read timeout
- NVS-backed host/port/tls config (namespace "bb_tcp"); TLS cert PEMs are
  always caller-supplied at init, never persisted
- adds BB_TCP_NVS_NS to bb_nv_namespaces.h, bb_tcp_client to
  [capability.core] in bbtool.toml, generated README via bbtool docs
  scaffold, fence --approve bb_tcp_client baseline entry

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

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