Reindent all C sources to the canonical stroustrup style

Mechanical whitespace-only change across src/, include/, tests/, and
util/, applied with scripts/reindent.sh. No behavioral change.

Most files already conformed. The genuine outliers indented at 2 columns
(json_helpers.c, util.c from akgl_rectangle_points onward, assets.c,
staticstring.c, akgl_actor_add_child, util.h, staticstring.h) or used
spaces where the canonical form is a tab (draw.c). cc-mode also re-aligns
line-continuation backslashes in multi-line macros to its default
c-backslash-column, which is required for the tree to be a fixed point of
the indenter.

Verified whitespace-only: `git diff -w` over this change is empty apart
from three trailing blank lines removed at EOF in src/heap.c,
src/registry.c, and tests/tilemap.c. The build produces no new errors and
ctest is unchanged at 13/14, with `character` still the one intentional
failure.

The tree is now a fixed point of `scripts/reindent.sh --check`.

include/akgl/SDL_GameControllerDB.h is generated and excluded.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

include/akgl/error.h

@@ -10,11 +10,11 @@
 // e.g., combining two element of PATH_MAX into a string buffer of AKGL_STRING_MAX_LENGTH.
 // We have to draw a line in the sand somewhere or we will just let our buffers grow forever
 // to keep the compiler happy.
-#define DISABLE_GCC_WARNING_FORMAT_TRUNCATION	\
-    _Pragma("GCC diagnostic push") \
+#define DISABLE_GCC_WARNING_FORMAT_TRUNCATION			\
+    _Pragma("GCC diagnostic push")				\
     _Pragma("GCC diagnostic ignored \"-Wformat-truncation\"")
 
-#define RESTORE_GCC_WARNINGS \
+#define RESTORE_GCC_WARNINGS			\
     _Pragma("GCC diagnostic pop")
 
 #define AKGL_ERR_SDL               (AKERR_LAST_ERRNO_VALUE + 18)

include/akgl/game.h

@@ -140,5 +140,5 @@ akerr_ErrorContext AKERR_NOIGNORE *akgl_game_state_unlock(void);
  * @throws AKERR_* Propagates an error reported by a delegated operation.
  */
 akerr_ErrorContext AKERR_NOIGNORE *akgl_game_update(akgl_Iterator *opflags);
-    
+
 #endif //_AKGL_GAME_H_

include/akgl/physics.h

@@ -26,7 +26,7 @@ typedef struct akgl_PhysicsBackend {
     double gravity_y;
     double gravity_z;
     SDL_Time gravity_time;
-    SDL_Time timer_gravity;    
+    SDL_Time timer_gravity;
 } akgl_PhysicsBackend;
 
 /**

include/akgl/staticstring.h

@@ -15,8 +15,8 @@
 /** @brief Provides a fixed-capacity, heap-managed string buffer. */
 typedef struct
 {
-  int refcount;
-  char data[AKGL_MAX_STRING_LENGTH];
+    int refcount;
+    char data[AKGL_MAX_STRING_LENGTH];
 } akgl_String;
 
 /**

include/akgl/util.h

@@ -11,17 +11,17 @@
 
 /** @brief Represents a two-dimensional point. */
 typedef struct point {
-  int x;
-  int y;
-  int z;
+    int x;
+    int y;
+    int z;
 } point;
 
 /** @brief Stores the corners of an axis-aligned rectangle. */
 typedef struct RectanglePoints {
-  point topleft;
-  point topright;
-  point bottomleft;
-  point bottomright;
+    point topleft;
+    point topright;
+    point bottomleft;
+    point bottomright;
 } RectanglePoints;
 
 #define AKGL_COLLIDE_RECTANGLES(r1x, r1y, r1w, r1h, r2x, r2y, r2w, r2h) ((r1x < (r2x + r2w)) || ((r1x + r1w) > r2x)