fix(core)!: enforce strict C89 compliance

BREAKING CHANGE: Public API now uses unsigned char instead of uint8_t

- Remove stdint.h dependency (C99 feature, not C89, I am a fucking idiot)
- Replace uint8_t with unsigned char throughout codebase
- Affects stk_init() return type and internal functions
- Corrects unintended C99 dependency, restoring intended C89 compliance

src/module.c

@@ -1,6 +1,5 @@
 #include "platform.h"
 #include "stk.h"
-#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -18,7 +17,7 @@ void **stk_handles = NULL;
 stk_init_mod_func *stk_inits = NULL;
 stk_shutdown_mod_func *stk_shutdowns = NULL;
 
-extern uint8_t stk_initialized;
+extern unsigned char stk_initialized;
 
 static char stk_mod_init_name[STK_MOD_FUNC_NAME_BUFFER] = "stk_mod_init";
 static char stk_mod_shutdown_name[STK_MOD_FUNC_NAME_BUFFER] =
@@ -43,7 +42,7 @@ void extract_module_id(const char *path, char *out_id)
 		*dot = '\0';
 }
 
-uint8_t is_valid_module_file(const char *filename)
+unsigned char is_valid_module_file(const char *filename)
 {
 	const char *ext;
 	size_t name_len;
@@ -72,7 +71,7 @@ int is_mod_loaded(const char *module_name)
 	return -1;
 }
 
-uint8_t stk_module_load(const char *path, int index)
+unsigned char stk_module_load(const char *path, int index)
 {
 	void *handle;
 	stk_init_mod_func init_func;
@@ -121,7 +120,7 @@ uint8_t stk_module_load(const char *path, int index)
 	return STK_MOD_INIT_SUCCESS;
 }
 
-uint8_t stk_module_load_init(const char *path, int index)
+unsigned char stk_module_load_init(const char *path, int index)
 {
 	int result;
 	result = stk_module_load(path, index);
@@ -155,7 +154,7 @@ void stk_module_free_memory(void)
 	stk_shutdowns = NULL;
 }
 
-uint8_t stk_module_init_memory(size_t capacity)
+unsigned char stk_module_init_memory(size_t capacity)
 {
 	stk_module_ids = malloc(capacity * sizeof(*stk_module_ids));
 	stk_handles = malloc(capacity * sizeof(void *));
@@ -170,7 +169,7 @@ uint8_t stk_module_init_memory(size_t capacity)
 	return STK_INIT_SUCCESS;
 }
 
-uint8_t stk_module_realloc_memory(size_t new_capacity)
+unsigned char stk_module_realloc_memory(size_t new_capacity)
 {
 	char (*new_module_ids)[STK_MOD_ID_BUFFER] = NULL;
 	void **new_handles = NULL;

src/platform.c

@@ -1,5 +1,4 @@
 #include "stk.h"
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -29,10 +28,10 @@
 #endif
 
 int is_mod_loaded(const char *module_name);
-uint8_t is_valid_module_file(const char *filename);
+unsigned char is_valid_module_file(const char *filename);
 void extract_module_id(const char *path, char *out_id);
 
-static uint8_t is_file_ready(const char *dir_path, const char *filename)
+static unsigned char is_file_ready(const char *dir_path, const char *filename)
 {
 	char full_path[STK_PATH_MAX_OS];
 #ifdef _WIN32
@@ -108,7 +107,7 @@ typedef struct {
 } platform_watch_context_t;
 #endif
 
-uint8_t platform_mkdir(const char *path)
+unsigned char platform_mkdir(const char *path)
 {
 #ifdef _WIN32
 	return CreateDirectoryA(path, NULL) ? STK_PLATFORM_OPERATION_SUCCESS
@@ -130,7 +129,7 @@ int platform_remove_file(const char *path)
 #endif
 }
 
-uint8_t platform_copy_file(const char *from, const char *to)
+unsigned char platform_copy_file(const char *from, const char *to)
 {
 	char buf[STK_PATH_MAX_OS];
 	int ret = STK_PLATFORM_FILE_COPY_ERROR;
@@ -203,7 +202,7 @@ done:
 	return ret;
 }
 
-uint8_t platform_remove_dir(const char *path)
+unsigned char platform_remove_dir(const char *path)
 {
 #ifdef _WIN32
 	WIN32_FIND_DATAA fd;

src/stk.c

@@ -1,7 +1,6 @@
 #include "stk.h"
 #include "platform.h"
 #include "stk_log.h"
-#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -16,7 +15,7 @@ extern char (*stk_module_ids)[STK_MOD_ID_BUFFER];
 
 extern size_t module_count;
 
-uint8_t stk_initialized = 0;
+unsigned char stk_initialized = 0;
 
 static char stk_mod_dir[STK_PATH_MAX_OS] = "mods";
 static char stk_tmp_name[STK_MOD_ID_BUFFER] = ".tmp";
@@ -30,18 +29,18 @@ void platform_directory_watch_stop(void *handle);
 stk_module_event_t *platform_directory_watch_check(
     void *handle, char (**file_list)[STK_PATH_MAX], size_t *out_count,
     char (*loaded_module_ids)[STK_MOD_ID_BUFFER], const size_t loaded_count);
-uint8_t platform_mkdir(const char *path);
-uint8_t platform_copy_file(const char *from, const char *to);
-uint8_t platform_remove_dir(const char *path);
+unsigned char platform_mkdir(const char *path);
+unsigned char platform_copy_file(const char *from, const char *to);
+unsigned char platform_remove_dir(const char *path);
 
 void extract_module_id(const char *path, char *out_id);
 int is_mod_loaded(const char *module_id);
 
 size_t stk_module_count(void);
-uint8_t stk_module_load(const char *path, int index);
-uint8_t stk_module_load_init(const char *path, int index);
-uint8_t stk_module_init_memory(size_t capacity);
-uint8_t stk_module_realloc_memory(size_t new_capacity);
+unsigned char stk_module_load(const char *path, int index);
+unsigned char stk_module_load_init(const char *path, int index);
+unsigned char stk_module_init_memory(size_t capacity);
+unsigned char stk_module_realloc_memory(size_t new_capacity);
 void stk_module_unload(size_t index);
 void stk_module_unload_all(void);
 
@@ -70,7 +69,7 @@ static const char *stk_error_string(int error_code)
 	}
 }
 
-uint8_t stk_init(void)
+unsigned char stk_init(void)
 {
 	char (*files)[STK_PATH_MAX] = NULL;
 	size_t file_count, i, successful_loads = 0;