Add test_finale.gb: ROM che porta subito al finale per test rapidi

build/test_finale.gb mostra immediatamente la schermata finale (testo
tragico + musica del finale su tutti e 3 i canali) all'avvio, senza
dover completare gli 8 livelli. Premi START per uscire.

- src/test_finale_render.c: setup palette invertita, font IBM,
  scrittura del messaggio nel map_buffer, init audio + VBL +
  game_over=3/timer=0 per far partire il sequencer del finale.
- Makefile: nuovo target build/test_finale.gb (aggiunto ad all).

Makefile

@@ -11,7 +11,7 @@ BUILD_DIR = build
 # C source files
 SRCS = $(SRC_DIR)/main.c $(SRC_DIR)/engine.c $(SRC_DIR)/globals.c $(SRC_DIR)/maze.c $(SRC_DIR)/sound.c $(SRC_DIR)/render.c $(SRC_DIR)/player_logic.c $(SRC_DIR)/enemy_logic.c $(SRC_DIR)/tiles.c $(SRC_DIR)/player.c $(SRC_DIR)/enemy.c $(SRC_DIR)/gameover.c $(SRC_DIR)/next_level.c $(SRC_DIR)/stamina.c $(SRC_DIR)/level.c $(SRC_DIR)/title_bg.c
 
-all: $(BUILD_DIR)/hello_iso.gb $(BUILD_DIR)/test_gameover.gb
+all: $(BUILD_DIR)/hello_iso.gb $(BUILD_DIR)/test_gameover.gb $(BUILD_DIR)/test_finale.gb
 
 # Generate image assets
 generate_images: $(SCRIPTS_DIR)/generate_assets.py $(SCRIPTS_DIR)/generate_enemy.py $(SCRIPTS_DIR)/generate_level.py
@@ -40,6 +40,10 @@ $(BUILD_DIR)/test_gameover.gb: generate_c_assets $(SRC_DIR)/test_gameover_render
 	mkdir -p $(BUILD_DIR)
 	$(LCC) -Wa-l -Wl-m -Wl-j -o $(BUILD_DIR)/test_gameover.gb $(SRC_DIR)/test_gameover_render.c $(SRC_DIR)/player.c $(SRC_DIR)/enemy.c $(SRC_DIR)/gameover.c $(SRC_DIR)/stamina.c
 
+$(BUILD_DIR)/test_finale.gb: $(SRC_DIR)/test_finale_render.c
+	mkdir -p $(BUILD_DIR)
+	$(LCC) -Wa-l -Wl-m -Wl-j -o $(BUILD_DIR)/test_finale.gb $(SRC_DIR)/test_finale_render.c $(SRC_DIR)/globals.c $(SRC_DIR)/sound.c
+
 clean:
 	rm -rf $(BUILD_DIR)/*
 	rm -f $(SRC_DIR)/tiles.c $(SRC_DIR)/tiles.h

src/test_finale_render.c

@@ -0,0 +1,69 @@
+#include <gb/gb.h>
+#include <stdint.h>
+#include <string.h>
+#include <gbdk/font.h>
+
+#include "globals.h"
+#include "sound.h"
+
+uint8_t app_state = 1;  // sound.c references this; not used in this test
+
+static void ending_puttext(uint8_t col, uint8_t row, const char *s) {
+    uint8_t i = 0;
+    while (s[i]) {
+        if (col + i < 32) {
+            map_buffer[(uint16_t)row * 32 + col + i] = (uint8_t)(s[i] - ' ');
+        }
+        i++;
+    }
+}
+
+void main(void) {
+    SPRITES_8x16;
+
+    OBP0_REG = 0xE4;
+    OBP1_REG = 0x1B;
+    BGP_REG = 0x1B;  // inverted palette: dark bg, light text
+
+    memset(map_buffer, 0, sizeof(map_buffer));
+    set_bkg_tiles(0, 0, 32, 32, map_buffer);
+
+    font_init();
+    font_t f = font_load(font_ibm);
+    font_set(f);
+
+    ending_puttext(3, 4,  "YOUR TORCH HAS");
+    ending_puttext(6, 5,  "RUN OUT,");
+    ending_puttext(2, 7,  "YOU ARE TRAPPED.");
+    ending_puttext(0, 10, "JUST ANOTHER SCREAM");
+    ending_puttext(3, 11, "FROM THE DARK.");
+    ending_puttext(5, 14, "GAME OVER");
+    set_bkg_tiles(0, 0, 32, 32, map_buffer);
+
+    NR52_REG = 0x80;
+    NR50_REG = 0x77;
+    NR51_REG = 0xFF;
+    sound_reset_music_state();
+    remove_VBL(play_music_tick);
+    add_VBL(play_music_tick);
+
+    // Trigger the finale music sequencer immediately (skip the 30-frame timer
+    // that the main game uses; here we want the music from frame 0).
+    game_over = 3;
+    game_over_timer = 0;
+
+    SHOW_BKG;
+    SHOW_SPRITES;
+    DISPLAY_ON;
+
+    uint8_t prev_keys = 0;
+    while (1) {
+        wait_vbl_done();
+        uint8_t keys = joypad();
+        if ((keys & J_START) && !(prev_keys & J_START)) {
+            level = 1;
+            break;
+        }
+        prev_keys = keys;
+    }
+}