Await without try/catch

Deeply nested try/catch blocks around every await make request handlers hard to read. A common alternative, borrowed from Go, is to have the call return both the error and the value and let the caller check which one is set.

Implement safeAwait(value). It accepts a promise or a plain value and returns a promise that **always fulfils** with a two-element array. If the input fulfils with v, resolve with [null, v]. If it rejects with e, resolve with [e, null]. A non-promise input is treated as an already-fulfilled value. The returned promise must never reject.

What it has to do

• Always fulfil with an array of exactly two elements.
• Use null — not undefined — for the empty slot.
• Accept plain values as well as promises.
• Never reject, whatever the input does.

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