Note

Replaces dynamic reducer factory registration with a fixed compile-time registry and updates RDCR_GetFactory to scan it; removes registration APIs/macros.

• Aggregate reducers (src/aggregate/reducer.c, src/aggregate/reducer.h):
  • Replace dynamic global registry with a static globalRegistry array of builtin reducers and a fixed REGISTRY_SIZE validated via static_assert.
  • Update RDCR_GetFactory to iterate over the fixed registry.
  • Remove runtime registration APIs (RDCR_RegisterFactory, RDCR_RegisterBuiltins) and related macros/constants.

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