[Crazy RoboTaxi] Remove unused "variants" left over from old map system

[aidanfnv]

Split off from #553, this change removes the map "variants" used by interactive-drive and the pre-API-port Crazy RoboTaxi demo, but not the ported version.

The interactive-drive scenes used previously have different time-of-day and weather variants, and the new map system does not make use of them. Time-of-day can be handled by bundling a different first frame and prompt (we could make it easier in future by adding time-of-day "variants" back, but likely not in this form being removed), and weather is now handled with live-edit features (though, again, we could pre-bake "weather" variants).

This functionality should be re-added in some form later, but leaving it here in a non-functional state has led to confusion from AI agents and has added unnecessary churn when using them to edit maps or map-adjacent systems.

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[aidanfnv]

/ok to test db1eca4

[greptile-apps]

Confidence Score: 3/5

The PR is not yet safe to merge because SwiftVR reports incorrectly attributed stage timings and automatic native-source acquisition can remain broken after an interrupted clone.

Summary

This PR removes Crazy RoboTaxi map variants and canonicalizes spawn conditioning, while subsequent changes add automatic OmniDreams native-source acquisition, windowed video decoding, shared profiling formatting, and SwiftVR metric plumbing.

• Flattens map spawn image and prompt fields and simplifies compiled scene archives.
• Removes the interactive-drive dependency from the game engine.
• Downloads OmniDreams native dependencies automatically into the artifact directory.
• Adds decode-time video windowing and SwiftVR stage metrics.
• Two new correctness issues remain in profiling attribution and interrupted-download recovery.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  Input[SwiftVR input chunk] --> Encode[Encoder]
  Encode --> Restore[Transformer restore]
  Restore --> Decode[Decoder]
  Decode --> Finalize[Finalize]
  Encode -->|record encode| Metrics[EventProfiler]
  Encode -->|current premature record diffuse| Metrics
  Decode -->|record decode| Metrics
  Finalize -->|record finalize| Metrics

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[aidanfnv]

/ok to test 95c4db4