Updated test imports and paths after modules/source/ removal: - Progressive integration tests for modules 03, 06, 08, 13, 14 - Checkpoint integration tests - Module completion orchestrator - Optimizer integration tests - Gradient flow regression tests Updated test documentation: - tests/README.md with new module paths - tests/TEST_STRATEGY.md with restructuring notes All tests now reference modules/XX_name/ instead of modules/source/.
- Rename tests/14_kvcaching to tests/14_profiling - Rename tests/15_profiling to tests/15_memoization - Aligns test structure with optimization tier reorganization
