style: fix include order in all source files

Move C stdlib headers before local/project headers with a
blank line separator, matching the AGENTS.md include order rule.

Replace em dash with colon in main.c comment.

ctdd/log_write.c

@@ -1,6 +1,7 @@
-#include "ctdd/log_write.h"
 #include <stdio.h>
 
+#include "ctdd/log_write.h"
+
 void log_write(char const* msg) {
     printf("%s\n", msg);
 }

ctdd/logger.c

@@ -1,6 +1,7 @@
+#include <stdio.h>
+
 #include "ctdd/logger.h"
 #include "ctdd/log_write.h"
-#include <stdio.h>
 
 static log_level s_level = LOG_DEBUG;
 

ctdd/report.c

@@ -1,6 +1,7 @@
+#include <stdio.h>
+
 #include "ctdd/report.h"
 #include "ctdd/logger.h"
-#include <stdio.h>
 
 void report_value(char const* label, int value) {
     char buf[256];

ctdd/str.c

@@ -1,6 +1,7 @@
-#include "ctdd/str.h"
-#include <string.h>
 #include <ctype.h>
+#include <string.h>
+
+#include "ctdd/str.h"
 
 int str_starts_with(char const* s, char const* prefix) {
     return strncmp(s, prefix, strlen(prefix)) == 0;

main.c

@@ -1,4 +1,4 @@
-// Template placeholder — replace with your own entry point.
+// Template placeholder: replace with your own entry point.
 // Remove or rename this file when scaffolding a new project.
 
 #include "ctdd/str.h"

tests/test_logger.c

@@ -1,4 +1,5 @@
 #include "unity.h"
+
 #include "ctdd/logger.h"
 #include "Mocklog_write.h"
 

tests/test_report.c

@@ -1,4 +1,5 @@
 #include "unity.h"
+
 #include "ctdd/report.h"
 #include "Mocklogger.h"
 

tests/test_str.c

@@ -1,4 +1,5 @@
 #include "unity.h"
+
 #include "ctdd/str.h"
 
 void setUp(void) {}