CodeRabbit Generated Unit Tests: Add integration and unit tests for compiler, parser, IR, runtime

[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/README_test_plan.md
• emberforge-compiler/tests/test_expr_lowerer.rs
• engraver-assembly-emit/tests/test_cranelift_backend.rs
• engraver-assembly-emit/tests/test_cranelift_intrinsics.rs
• ir/tests/test_sea_hasher.rs
• scribe-parser/tests/test_grammar.rs
• tests/test_zeta_fixtures.rs
• zetaruntime/tests/test_fiber.rs

[coderabbitai]

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