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/view/lane_keys.h

@@ -82,4 +82,4 @@ std::optional<std::string> modeIdFromLaneName(const std::string& laneName);
 // inputs (I_FREEMODE result, P_LANENAME string) and never re-derives this logic.
 bool isOnManualLane(bool isFixedLaneTrack, const std::string& laneName);
 
-}  // namespace reasampler::view
+}  // namespace reasampler::view