Civilization II first map renders placeholder terrain tiles

[benletchford]

Summary

After the first-map control-flow crash is fixed by #599, the public 68K Civilization II demo remains live but renders its terrain as repeated red/black placeholder polygons instead of the expected map artwork. This is a visual compatibility defect separate from the Window Manager activation-event bug in #597.

Reproduction

1. Load https://assets.systemless.org/games/civilization-ii.kpk with the Civilization II DEMO (68K) executable.
2. Dismiss the startup notice.
3. Start a new game and accept the default world, difficulty, civilization, leader, and city-style choices.
4. Dismiss the historical introduction to enter the map.

Observed behavior

The map remains responsive, but terrain cells appear as repeated red/black placeholder polygons rather than the game artwork.

Expected behavior

The initial world map should render its authentic terrain tiles while retaining live unit and map input.

Acceptance criteria

• The initial Civilization II map renders its terrain artwork without repeated placeholder polygons.
• The fix is generic and does not special-case Civilization II resources or drawing calls.
• A deterministic regression captures the rendered live map before and after a unit command.
• Existing QuickDraw and Window Manager tests continue to pass.

[benletchford]

Triage decision: keeping this open pending post-release revalidation. The palette/resource fixes landed in this batch could affect this symptom, but the SimCity II route also had an independent file-resolution problem during the palette PR review, so there is no valid map checkpoint proving authentic terrain yet. Close only after the deterministic first-map oracle renders real tiles.