Phase 121: Fix build errors after header split #115

Job	Run time
Code Quality Checks	1m 0s
Build & Test (clang-15, Debug)	28s
Build & Test (gcc-13, Release)	49s
Build & Test (gcc-13, Debug)	53s
Build & Test (clang-15, Release)	32s
Sanitizer Tests (ASAN + UBSAN)	35s
Performance Regression Check	1m 38s
Build Summary	3s
	5m 58s

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