Note

Replaces the dynamic reducer registry with a fixed compile-time table, updates RDCR_GetFactory to iterate it, and removes all runtime registration code and declarations.

• Aggregate/Reducers:
  • Static registry: Introduce static const globalRegistry with 14 built-in reducers and REGISTRY_SIZE + static_assert.
  • Factory lookup: RDCR_GetFactory now iterates the fixed registry (no lazy registration).
  • Removed runtime registration:
    • Delete RDCR_RegisterFactory, RDCR_RegisterBuiltins, isBuiltinsRegistered, and RDCR_XBUILTIN macro in src/aggregate/reducer.c.
    • Remove corresponding declarations from src/aggregate/reducer.h.

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