[adamico]

Summary

A Gallery test now checks only the Gallery itself. Scene behaviour is left to the mechanics' own game tests, which already check it more closely.

 GalleryTests.register
   gallery_builds_a_scene_of_each_feature
-  gallery_pump_scene_leaves_its_water_and_takes_its_lava   # covered by PumpTests
-  gallery_outlet_scene_sets_its_water_down                 # covered by OutletTests
   gallery_scenes_sign_clicked_builds_the_scene_again

Cut	Already covered by
Pump scene: water kept, lava taken	a_pump_beside_water_fills_its_pipe_and_leaves_the_water, a_pump_beside_lava_takes_the_source_block_into_a_tank (exact amounts)
Outlet scene: water set down	an_outlet_sets_a_bucket_of_water_down_as_a_source_block (500 mB left too)

The Pump → pipe → Outlet chain in the Outlet scene is no longer tested end to end. That was accepted in triage, and the scene is checked by eye in the dev client.

Closes #29

Evidence

• Before: runGameTestServer ran 4 Gallery tests.
  After: sh ./gradlew build runGameTestServer → All 129 required tests passed. The Gallery tests that ran were gallery_builds_a_scene_of_each_feature and gallery_scenes_sign_clicked_builds_the_scene_again, and the three covering Pump and Outlet tests ran and passed.

Merge Danger

Door: two-way

Only game-test code changes; it never ships. Reverting the commit brings the tests back.

Blast Radius: none

There are no Consumer-facing or shipped changes, so there's no CHANGELOG line.

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