V48 (specification-implementation): Add FAMILIARIZATION.md codebase w… #1350

Job	Run time
Validate GitHub Actions workflows	17s
Lint, Type-Check & Build	22s
CodeQL Analysis	0s
Super Linter (misc files)	-1s
E2E, Visual & DB Tests	0s
Unit & Integration Tests (mocks)	-1s
	37s

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