feat(stdlib): wasmCall extern for invoking WebAssembly exports by name

[hyperpolymath]

Adds the generic Option A surface from bindings #5: a single extern that lowers to exports[name](...args) on the --deno-esm backend, with Number coercion so i32/i64/f32/f64 returns all coerce to Float at the AffineScript boundary.

This is the smallest-scope / highest-leverage Tier-1 binding item — it unblocks idaptik vm/wasm (740 LoC) and every future WASM-host integration. Typed per-Zig-fn shims can layer on top per-consumer where typing discipline outweighs the generic surface's flexibility.

Surface:

pub extern fn wasmCall(
  exports: WasmExports,
  name: String,
  args: [Float]
) -> Float;

Lowering (lib/codegen_deno.ml):

__as_wasmCall(exports, name, args)
  = Number(exports[name](...(args || [])))

Test fixture tests/codegen-deno/wasm_call.{affine,harness.mjs} exercises the round-trip with a 41-byte hand-built wasm module exporting add(i32, i32) -> i32; all 7 codegen-deno harnesses pass.

Closes #414. Updates docs/bindings-roadmap.adoc row #5 status ◐ → ● and points the rationale at this PR.

[github-actions]

🔍 Hypatia Security Scan

Findings: 82 issues detected

Severity	Count
🔴 Critical	4
🟠 High	10
🟡 Medium	68

⚠️ Action Required: Critical security issues found!

View findings

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