Host functions that return Result<Array<Float64>, String> (or any float array) currently have no WASM memory allocation helper to do so. The existing helpers are:

• _alloc_result_ok_string — allocates a Result<String, String> Ok on the WASM heap
• _alloc_result_err_string — allocates a Result<String, String> Err on the WASM heap

A parallel _alloc_result_ok_float_array helper is needed that:

1. Allocates a float array header + payload on the WASM heap via the alloc export
2. Writes each f64 element at the correct 8-byte-aligned offset
3. Wraps it in a Result Ok variant and returns the pointer

Blocked by this

• #371 — Inference.embed returning vector embeddings as Result<Array<Float64>, String>

Scope

The helper lives in vera/codegen/api.py alongside the existing string allocators. The browser runtime (vera/browser/runtime.mjs) needs a matching JS implementation.