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/map/bank_sync.cpp

@@ -60,4 +60,4 @@ AssignConsumeDecision consumeDecision(const std::optional<AssignmentRequest>& re
     return d;
 }
 
-}  // namespace reasampler::instrument::map
+}  // namespace reasampler::instrument::map