`ui_draw_capture.sh` grows three knobs the second iteration needed:
* ARM=early presses F10 before the title exists, so a long window contains the
frames in which a screen is BUILT (it turns out none are — the title screen
submits the same 11 draws every frame and never rebuilds);
* TARGET=menu taps A once on the title and arms on the main menu, skipping
attract movies on the way — it does not get there, but the blocker it hits is
documented rather than worked around;
* EXTRA_FLAGS passes emulator cvars through (--create_profile_if_none,
--mem_watch=false, --log_level).
`ui_draw_order.py` follows the capture's new vertex format (x, y, z) and reports
the Z it now has.
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