Function complete 

pub fn complete(
    source: &str,
    offset: usize,
    platform: Platform,
) -> CompleteResult

Completion at a byte offset into an in-memory Bynk source, for the given platform (capability methods, types, keywords, in-scope locals, and value-receiver members — #808, the other half of #397 hover shipped). Single buffer, single call — no project files, no multi-doc overlay/caching (the wasm boundary has none of those, so files: None throughout).