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feat: add BB_ARR_STREAM streamed-array descriptor + storage/nvs no-cap conversion (B1-1077 PR-2) (#949)

- bb_serialize.h: bb_serialize_arr_cardinality_t (BB_ARR_FIXED/BB_ARR_STREAM),
  bb_serialize_arr_stream_t carrier, bb_serialize_iter_next_fn,
  BB_SERIALIZE_MAX_ROW_BYTES, bb_serialize_arr_buf_iter_t +
  bb_serialize_arr_stream_from_buf() generic flat-buffer iterator.
- bb_serialize_walk.c: one additive BB_TYPE_ARR branch for
  cardinality==BB_ARR_STREAM; the FIXED (cardinality==0) path is untouched.
- bb_serialize_populate.c / bb_serialize_json.c: reject BB_ARR_STREAM
  (BB_ERR_UNSUPPORTED / SIZE_MAX, matching the STR_N/REF precedent).
- bb_diag_section.h/.c: bb_diag_iter_fn two-phase (COUNT then FILL) hook,
  fill/iter XOR on bb_diag_section_t, reg-time stream-field validation
  (exactly one, elem_type OBJ, elem_size <= BB_SERIALIZE_MAX_ROW_BYTES),
  cached per-section stream elem_size accessor.
- bb_diag_section_dispatch.c: two-phase iter dispatch path -- the dispatcher
  owns the row arena (bb_malloc_prefer_spiram, freed after render); no
  defensive row-count backstop knob.
- storage/nvs: converted to a BB_ARR_STREAM iter section (no fixed row cap),
  preserving the exact system-namespace denylist + bb_settings schema
  overlay merge semantics; retires CONFIG_BB_DIAG_STORAGE_NVS_ENTRY_CAP.

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