CodeRabbit Generated Unit Tests: Add tests for expr lowering, Cranelift, parser, SeaHasher, and Zeta

[coderabbitai]

Unit test generation was requested by @FlameyosSnowy.

• Stabilize intrinsics and compiler to get ready for tests #3 (comment)

The following files were modified:

• emberforge-compiler/tests/expr_lowerer_tests.rs
• engraver-assembly-emit/tests/cranelift_backend_tests.rs
• engraver-assembly-emit/tests/cranelift_intrinsics_tests.rs
• ir/tests/sea_hasher_tests.rs
• scribe-parser/tests/grammar_pest_tests.rs
• tests/README.zeta-tests.md
• tests/input_zeta_tests.rs
• tests/intrinsics_zeta_tests.rs

[coderabbitai]

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