Replaced direct string members with indices into RiaStringPool for vector, well, group, and LGR names. Updated all constructors, accessors, and logic to use the string pool for storage and retrieval. This change reduces memory usage and improves performance for repeated string values.
Fixes by clang-format
Introduce RiaStringPool for efficient shared string storage and retrieval by index, with thread-safe access using shared mutex. Pre-allocate empty string at index 0. Add comprehensive unit tests covering core functionality, concurrency, edge cases, and realistic usage.
Magne Sjaastad