moving inline definition

Author: trvon

include/sqlite-vec-cpp/index/hnsw_threading.hpp

@@ -26,7 +26,7 @@ class SpinLock {
 /// Thread-local random number generator for parallel operations
 /// Avoids contention on shared RNG during parallel layer assignment
 class ThreadLocalRNG {
-    static thread_local std::mt19937 rng_;
+    static inline thread_local std::mt19937 rng_{std::random_device{}()};
     std::uniform_real_distribution<float> dist_{0.0f, 1.0f};
 
 public:
@@ -49,8 +49,6 @@ class ThreadLocalRNG {
     }
 };
 
-inline thread_local std::mt19937 ThreadLocalRNG::rng_{std::random_device{}()};
-
 /// Per-node lock array using pointer-based storage to avoid move issues
 class NodeLocks {
     std::vector<std::unique_ptr<SpinLock>> locks_;