Note

Encapsulates QueryError fields, adds new helper APIs, removes direct struct access/brace init, and updates all code/tests to use QueryError_Default/IsOk/HasError and new prefix-expansion warning helpers.

• Core/Error Handling:
  • Make QueryError fields private (rename to internal members) and add APIs: QueryError_Default, QueryError_IsOk, QueryError_HasReachedMaxPrefixExpansionsWarning, QueryError_SetReachedMaxPrefixExpansionsWarning (and QueryError_HasError now returns bool).
  • Remove QueryError_Init; replace brace initializers and .code == QUERY_OK checks with new helpers; eliminate direct access to .detail, .code, and reachedMaxPrefixExpansions.
• Executors/Processors:
  • Refactor aggregate, hybrid, coord, module, pipeline, query, vector index, and alias paths to the new API (e.g., QueryError_IsOk, warning helpers, QueryError_Default).
  • Adjust profiling/warning emission and timeout checks to use the new getters and helpers.
• Misc:
  • Update tests to new initialization and getters; include query_error.h where needed.
  • Minor logic cleanups (e.g., clone/clear errors instead of direct struct copies).

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