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vm: lower typed-return native (non-by-ref-target value)

OP_COERCE_RETURN pops the return value, applies non-strict early
return-type coercion via compiler.CoerceReturnValue (extracted from
runReturn.Run), and pushes the coerced value. emitReturn picks the
native path when:
 - the return value is non-nil, and
 - its shape isn't a property / array-access / static-prop (those
   trigger writeContext setup in runReturn.Run when the enclosing
   function returns by reference; the native emit can't reproduce
   that without knowing the by-ref flag at emit time).

For unsafe shapes, OP_TRY_FINALLY still AST-delegates the whole
return statement. Try-with-finally itself remains AST-delegated, so
returns inside finally-protected blocks continue to work through
the AST path.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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