refactor(dynamic): add recursive dependency resolution for C receivers, enhance harness generation logic, and expand test coverage

tests/dynamic_fixtures/class_method/c_recursive_deps/benign.c

@@ -0,0 +1,25 @@
+/* Benign control for the recursive C receiver fixture. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct ShellRunner {
+    int enabled;
+} ShellRunner;
+
+typedef struct CommandRunner {
+    ShellRunner *shell;
+} CommandRunner;
+
+typedef struct UserService {
+    CommandRunner *runner;
+} UserService;
+
+void UserService_run(UserService *self, const char *input, size_t len) {
+    (void)input;
+    (void)len;
+    if (!self || !self->runner || !self->runner->shell) {
+        return;
+    }
+    system("true");
+}

tests/dynamic_fixtures/class_method/c_recursive_deps/vuln.c

@@ -0,0 +1,26 @@
+/* ClassMethod C fixture with a receiver pointer and recursive struct deps. */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct ShellRunner {
+    int enabled;
+} ShellRunner;
+
+typedef struct CommandRunner {
+    ShellRunner *shell;
+} CommandRunner;
+
+typedef struct UserService {
+    CommandRunner *runner;
+} UserService;
+
+void UserService_run(UserService *self, const char *input, size_t len) {
+    (void)len;
+    if (!self || !self->runner || !self->runner->shell) {
+        return;
+    }
+    char buf[512];
+    snprintf(buf, sizeof(buf), "true %s", input ? input : "");
+    system(buf);
+}