Extract per-venue geometry specs into WorldBuilder

Add the Hollywood, Joke Shop and TV Studio tables for facade, window,
stair, street, nav, guard-spawn and feature data. Unknown ids fall back to
the boulevard. Use the specs for the core dimensions and gates, with a headless
test for the distinct venue data. Headless 230/230.

TODO.md

@@ -9,10 +9,11 @@ Today all three venues share the Hollywood `WorldBuilder` geometry, so the Joke
 concepts are only compared on lighting (noted in `tools/scene_concepts.py` `SHOTS`). They also
 have no stage in the committed `docs/screenshots/` gallery, only in `capture_realism.gd`.
 
-- [ ] Extract a geometry spec per venue instead of branching inline: a `scenario.` (or
-      `WorldBuilder`) table of facade width/height, door style, window rows, awning/marquee
-      flags, street furniture set, palette and props, defaulting to the Hollywood values so
-      nothing regresses.
+- [x] Extract a geometry spec per venue instead of branching inline: `WorldBuilder.VENUE_SPECS`
+      now holds facade/stair/street/nav dimensions, window/pilaster rows, guard spawn, feature
+      flags and prop placements for Hollywood, Joke Shop and TV Studio. Unknown ids fall back to
+      Hollywood; `test_venue_geometry_specs_are_distinct_and_defaulted` checks the narrow Joke Shop
+      facade, disabled skyline/marquee, studio bulb-canopy flag and fallback.
 - [ ] Joke Shop: narrow brick alley (10–12 m wide), one warm wall lantern as the key light,
       recessed door with a step, shuttered window, dumpster/AC clutter, no skyline ring — the
       alley concept has depth, not a horizon.