test(scenes): ✅ Add/update test scenes for gameplay mechanics, UI, and rendering components

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

src/game/engine/scenes/tests/claude_vs_ai_render_proof.gd.uid

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+uid://qem58n4bkyu8

src/game/engine/scenes/tests/culture_load_probe.gd.uid

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+uid://credckoyfheeb

src/game/engine/scenes/tests/full_game_demo_proof.gd.uid

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+uid://baw1amk64lwgx

src/game/engine/scenes/tests/gameplay_arc_overlay.gd.uid

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+uid://cfb4qrrhc14bw

src/game/engine/scenes/tests/gameplay_arc_proof.gd.uid

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+uid://dwde4tmoclfal

src/game/engine/scenes/tests/lens_switcher_proof.gd.uid

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+uid://cxuwsnfk0h8cx

src/game/engine/scenes/tests/map_size_comparison_proof.gd.uid

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+uid://c7g5qo7limkyb

src/game/engine/scenes/tests/procedural_renderer_proof.gd.uid

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+uid://bjmo3f1qgui8n

src/game/engine/scenes/tests/proof_civilian_capture.gd.uid

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+uid://bgj477von1a7h

src/game/engine/scenes/tests/proof_hybrid_merge.gd.uid

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+uid://ceiq61p7agvcl

src/game/engine/scenes/tests/proof_replay_viewer.gd.uid

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+uid://d4k8onxmgjxwv

src/game/engine/scenes/tests/stretch_panel_proof.gd.uid

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+uid://d0humn3yplso

src/game/engine/scenes/tests/war_declared_overlay_proof.gd.uid

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+uid://dpwqru716v3r7

src/game/engine/scenes/tests/wonder_built_banner_proof.gd.uid

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+uid://26oubg7vww8u

src/game/engine/scenes/tests/world_shape_preview.gd.uid

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+uid://cjvjvtprsv14p