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/reclaim/prune_reconcile.cpp

@@ -83,4 +83,4 @@ std::vector<std::string> pruneDeletePlan(const std::vector<std::string>& confirm
     return plan;
 }
 
-} // namespace reasampler::reclaim
+} // namespace reasampler::reclaim

src/core/reclaim/prune_reconcile.h

@@ -175,4 +175,4 @@ PruneReport buildPruneReport(const std::vector<std::string>& orphans,
 std::vector<std::string> pruneDeletePlan(const std::vector<std::string>& confirmed,
                                          const std::vector<std::string>& freshOrphans);
 
-} // namespace reasampler::reclaim
+} // namespace reasampler::reclaim