Perf: IntSurf_LineOn2S → std::vector + hot-path hash-op cleanups #3437

Job	Run time
Check code formatting	50s
Prepare and Build on macOS with Clang (x64)	21m 45s
Prepare and Build on Ubuntu with Clang (x64)	24m 55s
Prepare and Build on Windows with MSVC (x64)	25m 58s
Check for non-ASCII characters	43s
Test on macOS (x64)	51s
Run GTest on macOS with Clang (x64)	1m 15s
Regression Test on macOS (x64)	27s
Prepare and Build on Ubuntu with GCC (No PCH)	2m 53s
Run GTest on Linux with Clang (x64)	2m 15s
Test on Linux with Clang (x64)	2m 55s
Test on Windows (x64)	1m 39s
Run GTest on Windows with MSVC (x64)	1m 38s
Regression Test on Windows (x64)	1s
Run GTest on Ubuntu with GCC (No PCH, Debug)	1s
Regression Test on Linux with Clang (x64)	1s
Build Documentation	1s
Summarize Test Results	1s
	1h 28m 9s

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