Add built-in answer tones and automatic multiple-choice progression

Makefile

@@ -12,8 +12,8 @@ endif
 ifeq ($(VCC_CONFIGURATION),Test)
 CPPFLAGS += -DTEST_SEED=2709
 endif
-CPPFLAGS += -Iinclude
-CFLAGS = --coco --intermediate --deps --stack-space=2048 $(OPTIM)
+CPPFLAGS += -I.
+CFLAGS = --coco --intermediate --stack-space=2048 $(OPTIM)
 SOURCES = main.c src/quiz.c src/ui.c src/states.c src/map_data.c
 OBJECTS = $(SOURCES:%.c=obj/%.o)
 .PHONY: all build disk clean assets test
@@ -23,7 +23,8 @@ disk: build/CAPITAL.dsk
 build/CAPITAL.bin: $(OBJECTS)
 	@mkdir -p build
 	"$(CMOC)" --coco --intermediate --org=2000 --limit=7800 -o $@ $(OBJECTS) -lgime -linput -lbcontrol -lhirestxt
-obj/%.o: %.c include/quiz.h include/ui.h include/map_data.h Makefile
+# Explicit project headers avoid CMOC .d paths to expired VCC build snapshots.
+obj/%.o: %.c quiz.h ui.h map_data.h Makefile
 	@mkdir -p $(dir $@)
 	"$(CMOC)" $(CPPFLAGS) $(CFLAGS) --intdir=$(dir $@) -c -o $@ $<
 obj/boot.bin: tools/boot.c Makefile
@@ -36,10 +37,10 @@ build/CAPITAL.dsk: build/CAPITAL.bin obj/boot.bin
 assets:
 	python3 tools/prepare_assets.py
 test:
-	@mkdir -p build
-	cc -std=c99 -Wall -Wextra -Werror -DHOST_TEST -Iinclude tests/test_quiz.c src/quiz.c src/states.c -o build/test_quiz
-	./build/test_quiz
+	@set -e; quiz_test_dir=$$(mktemp -d "$${TMPDIR:-/tmp}/capital-quiz-host.XXXXXX"); \
+	trap 'rm -rf "$$quiz_test_dir"' EXIT HUP INT TERM; \
+	cc -std=c99 -Wall -Wextra -Werror -DHOST_TEST -I. tests/test_quiz.c src/quiz.c src/states.c -o "$$quiz_test_dir/test_quiz"; \
+	"$$quiz_test_dir/test_quiz"
 	python3 tests/check_assets.py
 clean:
 	rm -rf obj build
--include $(OBJECTS:.o=.d)