Add test cases demonstrating FBIP (Functional But In-Place) optimization: - test_fbip_clean.lux: Basic FBIP chain (map, filter, reverse) - test_fbip_allocs.lux: Single-owner allocation test with range/map/filter/reverse - test_no_fbip.lux: Demonstrates shared reference forcing rc>1 path - test_rc_comparison.lux: Comparison of FBIP vs non-FBIP allocations All tests verify no memory leaks with the RC system. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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634 B