refactor: try always returning promise

[pi0]

clk: ~5.46 GHz
cpu: AMD Ryzen 9 9950X3D 16-Core Processor
runtime: node 24.11.1 (x64-linux)

benchmark                   avg (min … max) p75 / p99    (min … top 1%)
------------------------------------------- -------------------------------
Hookable                     614.09 ns/iter 436.52 ns   2.96 µs █▂▁▁▁▁▁▁▁▁▁
HookableCore                  18.98 ns/iter  18.87 ns  29.44 ns ▂█▁▁▁▁▁▁▁▁▁
Hookable5                    635.16 ns/iter 412.14 ns   2.82 µs █▂▁▁▁▁▁▁▁▁▁
Hookable6RC1                 463.76 ns/iter 375.37 ns   2.88 µs █▁▁▁▁▁▁▁▁▁▁
Hookable6RC1Core              14.29 ns/iter  14.23 ns  25.85 ns ▂█▁▁▁▁▁▁▁▁▁

summary
  Hookable6RC1Core
   1.33x faster than HookableCore
   32.46x faster than Hookable6RC1
   42.99x faster than Hookable
   44.46x faster than Hookable5