Add header image capture script for blog post 0033

Headless screenshot tool for the audio_synth_demo SFXR scene.
Refs Kanboard #209 / #345.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tools/capture_audio_synth_header.py

@@ -0,0 +1,16 @@
+import mcrfpy
+from mcrfpy import automation
+import runpy, sys, pathlib
+
+OUT = sys.argv[1] if len(sys.argv) > 1 else "image00.png"
+
+demo_path = (pathlib.Path(__file__).resolve().parent.parent /
+             "tests" / "demo" / "audio_synth_demo.py")
+runpy.run_path(str(demo_path), run_name="__demo__")
+
+def shot(timer, runtime):
+    automation.screenshot(OUT)
+    print(f"Wrote {OUT}")
+    sys.exit(0)
+
+mcrfpy.Timer("header_shot", shot, 150)