Q-W1 code-review follow-ups: restore 104 trailing newlines, relocate reasampler_uid.h to core/wire, drop ext_keys namespaces shim, add slot_map_tests, golden serialize literals for 4 modules, namespaces.h/pragma-once ordering sweep. 60/60 green.

src/core/instrument/engine/pitch_shift.cpp

@@ -431,4 +431,4 @@ AudioSample PitchShifter::processImpl(AudioSample in, const SpliceEvent* linked)
     return static_cast<AudioSample>(out);
 }
 
-}  // namespace reasampler::instrument::engine
+}  // namespace reasampler::instrument::engine