v8 boundary: array marshal for T[] return types

[cs01]

Pragma-file functions declared (): number[] or (): string[] currently fall through to opaque JSHandle. Native caller can't iterate.

Ask

Marshal synth (src/marshal-wrapper.ts) detects array return types. Emits loop:

1. cs_v8_handle_array_length(handle) -> number
2. For each index cs_v8_handle_array_get(handle, i) -> JSHandle
3. Unmarshal each element per element type
4. Build native number[] / string[] array

New bridge fns (c_bridges/node-bridge.cc)

• double cs_v8_handle_array_length(double h)
• double cs_v8_handle_array_get(double h, double i)

Scope

• Supported element types v1: number, string, boolean
• Nested arrays (number[][]): later
• Fixture: pragma exports () => [1,2,3], native sums it

Est

~200-300 LOC. ~1 day.