Add FPS counter, VSync toggle, shader metadata system, and multi-pass infrastructure

- FPS counter in window title (updates every 500ms)
- F4 key toggles VSync on/off
- Shader metadata: Name and Author from comments
- iChannel metadata parsing for multi-pass support
- Base structures: ShaderBuffer, ShaderPass
- FBO/texture management functions
- Updated all 11 shaders with Name/Author metadata

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

third_party/jail_audio.h

@@ -0,0 +1,43 @@
+#pragma once
+#include <SDL3/SDL.h>
+
+enum JA_Channel_state { JA_CHANNEL_INVALID, JA_CHANNEL_FREE, JA_CHANNEL_PLAYING, JA_CHANNEL_PAUSED, JA_SOUND_DISABLED };
+enum JA_Music_state { JA_MUSIC_INVALID, JA_MUSIC_PLAYING, JA_MUSIC_PAUSED, JA_MUSIC_STOPPED, JA_MUSIC_DISABLED };
+
+struct JA_Sound_t;
+struct JA_Music_t;
+
+void JA_Update();
+
+void JA_Init(const int freq, const SDL_AudioFormat format, const int num_channels);
+void JA_Quit();
+
+JA_Music_t *JA_LoadMusic(const char* filename);
+JA_Music_t *JA_LoadMusic(Uint8* buffer, Uint32 length);
+void JA_PlayMusic(JA_Music_t *music, const int loop = -1);
+char *JA_GetMusicFilename(JA_Music_t *music = nullptr);
+void JA_PauseMusic();
+void JA_ResumeMusic();
+void JA_StopMusic();
+void JA_FadeOutMusic(const int milliseconds);
+JA_Music_state JA_GetMusicState();
+void JA_DeleteMusic(JA_Music_t *music);
+float JA_SetMusicVolume(float volume);
+void JA_SetMusicPosition(float value);
+float JA_GetMusicPosition();
+void JA_EnableMusic(const bool value);
+
+JA_Sound_t *JA_NewSound(Uint8* buffer, Uint32 length);
+JA_Sound_t *JA_LoadSound(Uint8* buffer, Uint32 length);
+JA_Sound_t *JA_LoadSound(const char* filename);
+int JA_PlaySound(JA_Sound_t *sound, const int loop = 0, const int group=0);
+int JA_PlaySoundOnChannel(JA_Sound_t *sound, const int channel, const int loop = 0, const int group=0);
+void JA_PauseChannel(const int channel);
+void JA_ResumeChannel(const int channel);
+void JA_StopChannel(const int channel);
+JA_Channel_state JA_GetChannelState(const int channel);
+void JA_DeleteSound(JA_Sound_t *sound);
+float JA_SetSoundVolume(float volume, const int group=0);
+void JA_EnableSound(const bool value);
+
+float JA_SetVolume(float volume);