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/guid_diff.cpp

@@ -41,4 +41,4 @@ void GuidBaseline::reset() {
     primed_ = false;  // next observe() re-baselines (first-poll guard re-armed)
 }
 
-}  // namespace reasampler::view
+}  // namespace reasampler::view

src/core/view/guid_diff.h

@@ -59,4 +59,4 @@ private:
     bool                  primed_ = false;  // false ⇒ next observe() sets the baseline
 };
 
-}  // namespace reasampler::view
+}  // namespace reasampler::view

src/core/view/lane_keys.cpp

@@ -48,4 +48,4 @@ bool isOnManualLane(bool isFixedLaneTrack, const std::string& laneName) {
     return !hasManagedPrefix(laneName);
 }
 
-}  // namespace reasampler::view
+}  // namespace reasampler::view

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

src/core/view/mode_switch.cpp

@@ -61,4 +61,4 @@ int hitTestSegment(int px, int py, const HeaderRect& header, int segmentCount) {
     return -1;
 }
 
-} // namespace reasampler::view
+} // namespace reasampler::view

src/core/view/mode_switch.h

@@ -46,4 +46,4 @@ std::vector<SegmentRect> computeSegmentRects(const HeaderRect& header,
 // the panel drew there.
 int hitTestSegment(int px, int py, const HeaderRect& header, int segmentCount);
 
-} // namespace reasampler::view
+} // namespace reasampler::view

src/core/view/view_tree.cpp

@@ -38,4 +38,4 @@ FolderTree buildFolderTree(const std::vector<TrackFolderEntry>& entries) {
     return tree;
 }
 
-} // namespace reasampler::view
+} // namespace reasampler::view

src/core/view/view_tree.h

@@ -30,4 +30,4 @@ struct TrackFolderEntry {
 // is clamped to empty) so a corrupt/stale project can never fault the shell.
 FolderTree buildFolderTree(const std::vector<TrackFolderEntry>& entries);
 
-} // namespace reasampler::view
+} // namespace reasampler::view