feat: add video xcorr lab with gray proxy support

Makefile

@@ -14,7 +14,7 @@ else
   PIP_INSTALL = $(PIP) install
 endif
 
-.PHONY: default install install-cpu install-rocm install-cuda extract extract-loud picker ast sync verify clean help
+.PHONY: default install install-cpu install-rocm install-cuda extract extract-loud proxy picker ast vst sync verify clean help
 
 default: ast
 
@@ -26,8 +26,10 @@ help:
 	@echo "  make install-cuda   # force CUDA torch"
 	@echo "  make extract        # run extract.py (uses config.toml if present)"
 	@echo "  make extract-loud   # extract with loud-only gating (keep explosions/transients)"
+	@echo "  make proxy          # build gray analysis proxies from extracted masters (local only)"
 	@echo "  make picker         # visual picker: select start/duration before extraction"
 	@echo "  make ast            # run sync_audio_test.py (audio_sync_test, PyQtGraph GUI)"
+	@echo "  make vst            # run sync_video_test.py (video xcorr lab, PyQtGraph GUI)"
 	@echo "  make sync LAG=0.042 # run apply_sync.py to mux synced output (LAG in seconds)"
 	@echo "  make verify LAG=0.042  # verify sync: video + dual waveform player"
 	@echo "  make clean"
@@ -87,6 +89,9 @@ extract:
 extract-loud:
 	@if [ -x $(PY) ]; then $(PY) extract.py loud; else python3 extract.py loud; fi
 
+proxy:
+	@if [ -x $(PY) ]; then $(PY) extract.py proxy; else python3 extract.py proxy; fi
+
 picker:
 	@if [ -x $(PY) ]; then QT_QPA_PLATFORM=xcb QT_STYLE_OVERRIDE=Fusion $(PY) picker.py --config $(CONFIG); else QT_QPA_PLATFORM=xcb QT_STYLE_OVERRIDE=Fusion python3 picker.py --config $(CONFIG); fi
 
@@ -112,5 +117,22 @@ ast:
 	fi
 	@if [ -x $(PY) ]; then LC_NUMERIC=C PYTHONPATH=. QT_STYLE_OVERRIDE=Fusion $(PY) sync_audio_test.py --config $(CONFIG); else LC_NUMERIC=C PYTHONPATH=. QT_STYLE_OVERRIDE=Fusion python3 sync_audio_test.py --config $(CONFIG); fi
 
+vst:
+	@VIDEO_A=$$(python3 -c "import tomllib; c=tomllib.load(open('config.toml','rb')); print(c['extract'].get('file_a',''))" 2>/dev/null); \
+	VIDEO_B=$$(python3 -c "import tomllib; c=tomllib.load(open('config.toml','rb')); print(c['extract'].get('file_b',''))" 2>/dev/null); \
+	OUT=$$(python3 -c "import tomllib; c=tomllib.load(open('config.toml','rb')); print(c['extract'].get('out_dir','extracted'))" 2>/dev/null); \
+	STEM_A=$$(basename "$$VIDEO_A" | sed 's/\.[^.]*$$//'); \
+	STEM_B=$$(basename "$$VIDEO_B" | sed 's/\.[^.]*$$//'); \
+	if [ ! -f "$$OUT/$${STEM_A}_video.mkv" ] || [ ! -f "$$OUT/$${STEM_B}_video.mkv" ]; then \
+		echo "=> extracted masters not found, running make extract first..."; \
+		$(MAKE) extract; \
+	elif [ ! -f "$$OUT/$${STEM_A}_proxy.mkv" ] || [ ! -f "$$OUT/$${STEM_B}_proxy.mkv" ]; then \
+		echo "=> masters exist but proxies missing, running make proxy (local only)..."; \
+		$(MAKE) proxy; \
+	else \
+		echo "=> extracted videos exist, skipping extract/proxy"; \
+	fi
+	@if [ -x $(PY) ]; then LC_NUMERIC=C PYTHONPATH=. QT_STYLE_OVERRIDE=Fusion $(PY) sync_video_test.py --config $(CONFIG); else LC_NUMERIC=C PYTHONPATH=. QT_STYLE_OVERRIDE=Fusion python3 sync_video_test.py --config $(CONFIG); fi
+
 clean:
 	rm -rf $(VENV) __pycache__ .pytest_cache