feat: add global functions parseInt, parseFloat, isNaN, isFinite, Number, String, Boolean

[jtippett]

Summary

Agent-generated code constantly reaches for parseInt/parseFloat/isNaN/isFinite and the Number/String/Boolean conversion functions; today a bare call compiles to LoadGlobal → undefined → "x is not a function". All seven are pure computation with no sandbox surface.

Changes

• The seven names are recognized at compile time (shadowable by a local of the same name — the same mechanism as external functions).
• New CallBuiltin instruction dispatching to builtins::call_global_function.
• Tests in tests/builtins.rs.

Test plan

• Unit tests pass (cargo test)
• make lint clean
• Test262: built-ins/parseInt 0% → 73%, parseFloat 0% → 76%
• CI passes

Related issues

None open. We run this patch in production via ex_zapcode.

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📥 Commits

Reviewing files that changed from the base of the PR and between ebc06fd and bc6044d.

📒 Files selected for processing (5)

• crates/zapcode-core/src/compiler/instruction.rs
• crates/zapcode-core/src/compiler/mod.rs
• crates/zapcode-core/src/vm/builtins.rs
• crates/zapcode-core/src/vm/mod.rs
• crates/zapcode-core/tests/builtins.rs

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