Function calls support

[0xGeorgii]

Closes #136

[codecov]

Codecov Report

❌ Patch coverage is 55.95238% with 74 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
core/wasm-codegen/src/compiler.rs	55.15%	74 Missing ⚠️

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[Copilot]

Pull request overview

This pull request implements function call support for the WebAssembly code generator, enabling the compiler to emit WASM call instructions for plain identifier-based function calls. The implementation includes function parameter lowering, forward reference support, and proper handling of void vs. value-returning functions in expression contexts.

Changes:

• Function parameters are mapped to WASM local indices 0..n, with body locals starting at n
• Pre-scan builds a function name-to-index map for forward reference resolution
• Function calls are lowered to WASM call instructions with positional arguments
• Drop instruction emission is correctly handled based on whether expressions produce values and context

Reviewed changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
core/wasm-codegen/src/lib.rs	Adds pre-scan call to build function name-to-index map before compilation
core/wasm-codegen/src/errors.rs	Introduces CodegenError enum for function call lowering errors
core/wasm-codegen/src/compiler.rs	Implements function parameter lowering, call instruction emission, and Drop logic refinement
core/wasm-codegen/Cargo.toml	Adds thiserror dependency for error types
tests/src/codegen/wasm/validation.rs	Adds 18 validation tests covering parameters, calls, Drop logic, and edge cases
tests/src/codegen/wasm/base.rs	Adds integration tests with execution validation for parameters and calls
tests/test_data/codegen/wasm/base/fn_params/	Test data for function parameter tests
tests/test_data/codegen/wasm/base/fn_calls/	Test data for function call tests
CHANGELOG.md	Documents new functionality and links PR #136

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