chore(deps): switch mimalloc3 to upstream microsoft/mimalloc

.gitmodules

@@ -3,5 +3,5 @@
 	url = https://github.com/microsoft/mimalloc.git
 [submodule "libmimalloc-sys/c_src/mimalloc3"]
 	path = libmimalloc-sys/c_src/mimalloc3
-	url = https://github.com/napi-rs/mimalloc.git
+	url = https://github.com/microsoft/mimalloc.git
 	branch = dev3

libmimalloc-sys/build.rs

@@ -76,10 +76,18 @@ fn main() {
         cmake_config.define("MI_LOCAL_DYNAMIC_TLS", "ON");
     }
 
-    // Note: the previous `-DMI_HAS_TLS_SLOT=0` workaround for Apple has been
-    // replaced by a vendored source patch in our mimalloc fork (napi-rs/mimalloc
-    // dev3) that routes Apple to `MI_TLS_MODEL_THREAD_LOCAL + MI_TLS_RECURSE_GUARD`
-    // directly in `include/mimalloc/prim.h`. See that patch for the full rationale.
+    // On macOS, mimalloc v3 defaults to a fixed TLS slot (TCB[108]/[109]) shared by
+    // every image, so a second statically-linked copy (e.g. another napi addon)
+    // adopts the first's per-thread heap and crashes. Force the thread-local model
+    // so each image gets its own `__thread` storage (a v3-only cmake option from
+    // microsoft/mimalloc b83dee64, issue #1301).
+    if env::var_os("CARGO_FEATURE_V3").is_some() && target_os == "macos" {
+        cmake_config
+            .define("MI_TLS_MODEL_LOCAL", "ON")
+            // macOS may allocate on a thread-local's first access; guard against
+            // re-entering malloc until the process is initialized.
+            .define("MI_TLS_RECURSE_GUARD", "ON");
+    }
 
     if (target_os == "linux" || target_os == "android")
         && env::var_os("CARGO_FEATURE_NO_THP").is_some()