feat: Demo-Examples (Python/Rust/Go/C) mit Protokoll-Templates und Restore-Skript

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

examples/c-linkedlist/linked_list.c

@@ -0,0 +1,43 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include "linked_list.h"
+
+Node *node_new(int value) {
+    Node *n = malloc(sizeof(Node));
+    n->value = value;
+    n->next  = NULL;
+    return n;
+}
+
+Node *list_prepend(Node *head, int value) {
+    Node *n = node_new(value);
+    n->next  = head;
+    return n;
+}
+
+Node *list_append(Node *head, int value) {
+    Node *n = node_new(value);
+    if (!head) return n;
+    Node *cur = head;
+    while (cur->next) cur = cur->next;
+    cur->next = n;
+    return head;
+}
+
+void list_print(const Node *head) {
+    for (const Node *cur = head; cur; cur = cur->next)
+        printf("%d ", cur->value);
+    printf("\n");
+}
+
+/* BUG: Speicher wird nicht freigegeben — valgrind meldet Leaks. */
+void list_free(Node *head) {
+    (void)head;  /* TODO: implementieren */
+}
+
+int list_length(const Node *head) {
+    int len = 0;
+    for (const Node *cur = head; cur; cur = cur->next)
+        len++;
+    return len;
+}