Remove auto-await from untrusted async imports

[milkyskies]

Untrusted imports that return Promise<T> are currently auto-awaited — the compiler silently generates await (async () => { try { ... await call() ... } catch ... })(). The caller gets Result<T, Error> without writing |> await.

This hides async behavior, contradicting Floe's design principle that effects are explicit in types (|> await requires Promise<T> return type).

Proposed change

Remove the outer await from the untrusted IIFE. The IIFE still catches rejections, but returns Promise<Result<T, Error>> instead of Result<T, Error>. The user explicitly awaits:

// Before (hidden async):
const result = npmAsyncFn()           // Result<T, Error> — silently async

// After (explicit):
const result = npmAsyncFn() |> await  // Promise<Result<T, Error>> → Result<T, Error>

Also update

• docs/site/src/content/docs/docs/reference/stdlib/promise.md — remove auto-await claims
• docs/site/src/pages/index.astro — fix getUser example
• docs/llms.txt — update npm import section
• docs/design.md — update async section
• Example apps if affected