examples: clean up comments and remove redundant defaults loop

example-01.c:
- Fix typo: '&addr' -> '&attr' in attribute iteration comment
- Replace 'while (config != NULL)' with idiomatic 'while (list)'
- Rename variable config -> list for clarity
- Replace manual return-on-failure count check with assert()
- Remove "only used for testing" comment by using assert

example-02.c:
- Remove opening comment about attributes->current internal state;
  that detail is now documented in canfigger.h
- Remove redundant upfront defaults loop; the post-parse missing-keys
  loop is sufficient and is the canonical pattern

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

Author: andy5995

example-01.c

@@ -18,63 +18,40 @@ main(int argc, char *argv[])
     return -1;
   }
 
-  //
-  // Get a linked list containing the parsed config file. Each node contains
-  // a key (or a "setting", or an "option"), a value and attributes (if they
-  // are provided in your program's configuration file.
-  //
-  // The second argument is based on what the config file uses to separate
-  // the attributes.
-  //
-  struct Canfigger *config = canfigger_parse_file(filename_ptr, ',');
-
-  if (!config)
+  // Parse the config file. The second argument is the delimiter used to
+  // separate the value from any attributes on the same line.
+  struct Canfigger *list = canfigger_parse_file(filename_ptr, ',');
+  if (!list)
     return -1;
 
-  // i is only used for testing
-  int i = 0;
+  int count = 0;
 
-  while (config != NULL)
+  while (list)
   {
-    //
-    // The value member of the node must be checked for NULL
-    // before using it.
-    //
-    printf("Key: %s, Value: %s\n", config->key,
-           config->value != NULL ? config->value : "NULL");
+    // value may be NULL for keys with no '=' on the line.
+    printf("Key: %s, Value: %s\n", list->key,
+           list->value ? list->value : "NULL");
 
-    //
-    // Process attributes if necessary. If you know there are no attributes
-    // for the current node, you can skip this, and there is no reason in
-    // this case to call canfigger_free_current_attr_str_advance().
-    //
-    // attr must be declared and initialized before using it as an
-    // argument to canfigger_free_current_attr_str_advance().
+    // Iterate attributes if present. Initialize attr to NULL before the
+    // first call; each call frees the previous string and loads the next.
+    // Skip this block entirely if the node has no attributes.
     char *attr = NULL;
-    //
-    // Pass '&addr' to this function and it will get assigned an
-    // attribute, or NULL if there are none.
-    canfigger_free_current_attr_str_advance(config->attributes, &attr);
+    canfigger_free_current_attr_str_advance(list->attributes, &attr);
     while (attr)
     {
       printf("Attribute: %s\n", attr);
-
-      //
-      // Get the next attribute in the list (if there is one).
-      //
-      canfigger_free_current_attr_str_advance(config->attributes, &attr);
+      canfigger_free_current_attr_str_advance(list->attributes, &attr);
     }
 
-    // Move to the next node and automatically free the current node
-    canfigger_free_current_key_node_advance(&config);
+    // Free the current node and advance to the next.
+    canfigger_free_current_key_node_advance(&list);
     putchar('\n');
 
-    i++;
+    count++;
   }
 
-  // This should be the number of keys in the example config
-  if (i != 6)
-    return -1;
+  // Verify all entries in the example config were visited.
+  assert(count == 6);
 
   return 0;
 }

example-02.c

@@ -5,10 +5,6 @@
  *
  * Numeric attribute lists use the form:
  *   key = list, v1, v2, ...
- *
- * attributes->current is NULL when a node is first returned; the caller must
- * invoke canfigger_free_current_attr_str_advance() with attr=NULL to load
- * the first attribute before entering the loop.
  */
 
 #include "tests/test.h"
@@ -158,10 +154,6 @@ main(int argc, char *argv[])
 
   AppConfig_t config = { 0 };
 
-  /* Apply defaults for all scalar entries up front. */
-  for (size_t i = 0; i < ARRAY_SIZE(entries); i++)
-    config_set_field(&config, &entries[i], entries[i].default_value);
-
   struct Canfigger *list = canfigger_parse_file(filename_ptr, ',');
   if (!list)
     return -1;