- game_state.gd: add boundary_positions Dictionary field; BoundaryWall tiles from
visible_tiles go to boundary_positions instead of visible_positions — rendered by
tile_renderer but not tracked as explored fog memory
- fog_state.gd: update_from_state() writes VIS_FORWARD for boundary_positions so fog
lifts over margin wall content; boundary tiles excluded from exploration step so they
don't persist as EXP_EXPLORED when player turns away
- tile_renderer.gd: no changes needed — renders all visible_tiles by type, sector-agnostic
- test_fog_shader.gd: 4 new tests — boundary excluded from visible_positions, tracked in
boundary_positions, cleared each snapshot, fog lifts to VIS_FORWARD
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Sonnet 4.6
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