fix(ffi): reject extension failures with Error objects

changelog.d/8750-ext-error-objects.md

@@ -0,0 +1 @@
+Reject native-extension failures with real JavaScript `Error` objects, including `.message`/`.stack`, and preserve mysql2-compatible `.code`/`.errno` metadata for common MySQL server errors.

crates/perry-ext-events/src/test_async_shims.rs

@@ -1,4 +1,5 @@
 use perry_ffi::Promise;
+use std::ffi::c_void;
 
 // Unit-test binaries do not link the host stdlib/runtime archive that normally
 // provides the perry_ffi async bridge. Keep these test-only shims synchronous.
@@ -23,3 +24,12 @@ pub extern "C" fn perry_ffi_promise_reject_bits(promise: *mut Promise, bits: u64
         f64::from_bits(bits),
     );
 }
+
+#[no_mangle]
+pub extern "C" fn perry_ffi_promise_reject_deferred(
+    promise: *mut Promise,
+    ctx: *mut c_void,
+    invoke: extern "C" fn(*mut c_void) -> u64,
+) {
+    perry_ffi_promise_reject_bits(promise, invoke(ctx));
+}

crates/perry-ext-fetch/src/test_async_shims.rs

@@ -22,6 +22,15 @@ pub extern "C" fn perry_ffi_promise_reject_bits(promise: *mut Promise, bits: u64
     );
 }
 
+#[no_mangle]
+pub extern "C" fn perry_ffi_promise_reject_deferred(
+    promise: *mut Promise,
+    ctx: *mut c_void,
+    invoke: extern "C" fn(*mut c_void) -> u64,
+) {
+    perry_ffi_promise_reject_bits(promise, invoke(ctx));
+}
+
 #[no_mangle]
 pub extern "C" fn perry_ffi_spawn_blocking(ctx: *mut c_void, invoke: extern "C" fn(*mut c_void)) {
     invoke(ctx);

crates/perry-ext-http/src/test_async_shims.rs

@@ -38,6 +38,15 @@ pub extern "C" fn perry_ffi_promise_resolve_deferred(
     perry_ffi_promise_resolve_bits(promise, invoke(ctx));
 }
 
+#[no_mangle]
+pub extern "C" fn perry_ffi_promise_reject_deferred(
+    promise: *mut Promise,
+    ctx: *mut c_void,
+    invoke: extern "C" fn(*mut c_void) -> u64,
+) {
+    perry_ffi_promise_reject_bits(promise, invoke(ctx));
+}
+
 #[no_mangle]
 pub extern "C" fn perry_ffi_spawn_blocking(ctx: *mut c_void, invoke: extern "C" fn(*mut c_void)) {
     invoke(ctx);