Phase 116.1: Fix Clang 15 sign-conversion errors in span accessors #81

Job	Run time
Code Quality Checks	58s
Build & Test (gcc-13, Debug)	42s
Build & Test (clang-15, Debug)	1m 2s
Build & Test (gcc-13, Release)	1m 2s
Build & Test (clang-15, Release)	54s
Sanitizer Tests (ASAN + UBSAN)	1m 48s
Performance Regression Check	1m 20s
Build Summary	3s
	7m 49s

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