Fix coroutine queue/array consistency: ensure coroutine is added to ASYNC_G(coroutines) immediately after enqueue

Move the addition of coroutine to ASYNC_G(coroutines) hash table to occur
immediately after adding to the coroutine_queue, before any callback invocations
that might throw exceptions.

This prevents a critical race condition where:
1. Coroutine is added to coroutine_queue (line 154-158)
2. Exception occurs in after_coroutine_enqueue or afterCoroutineEnqueue callbacks
3. Function returns NULL without adding coroutine to ASYNC_G(coroutines)
4. Scheduler later extracts coroutine from queue and tries to execute it
5. async_coroutine_execute() fails trying to remove non-existent entry from ASYNC_G(coroutines)

Changes:
- Move zend_hash_index_add_ptr() call from line 193 to line 166
- Move ZEND_ASYNC_INCREASE_COROUTINE_COUNT from line 199 to line 172
- Ensures atomicity: if coroutine is in queue, it's also in the hash table
- Callback errors now occur after coroutine is properly registered in both structures

This guarantees consistency between ASYNC_G(coroutine_queue) and ASYNC_G(coroutines).

Author: EdmondDantes

async_API.c

@@ -163,6 +163,14 @@ zend_coroutine_t *spawn(zend_async_scope_t *scope, zend_object *scope_provider,
 		return NULL;
 	}
 
+	if (UNEXPECTED(zend_hash_index_add_ptr(&ASYNC_G(coroutines), coroutine->std.handle, coroutine) == NULL)) {
+		waker->status = ZEND_ASYNC_WAKER_IGNORED;
+		async_throw_error("Failed to add coroutine to the list");
+		return NULL;
+	}
+
+	ZEND_ASYNC_INCREASE_COROUTINE_COUNT;
+
 	scope->after_coroutine_enqueue(&coroutine->coroutine, scope);
 	if (UNEXPECTED(EG(exception))) {
 		waker->status = ZEND_ASYNC_WAKER_IGNORED;
@@ -190,14 +198,6 @@ zend_coroutine_t *spawn(zend_async_scope_t *scope, zend_object *scope_provider,
 		zval_ptr_dtor(&options);
 	}
 
-	if (UNEXPECTED(zend_hash_index_add_ptr(&ASYNC_G(coroutines), coroutine->std.handle, coroutine) == NULL)) {
-		waker->status = ZEND_ASYNC_WAKER_IGNORED;
-		async_throw_error("Failed to add coroutine to the list");
-		return NULL;
-	}
-
-	ZEND_ASYNC_INCREASE_COROUTINE_COUNT;
-
 	return &coroutine->coroutine;
 }