Fix test API mismatches: time display tests target InsertOverlay/
TimeDisplay and time_display.gd; E-Talk tests rewritten to target
interaction_list.gd _cache_entity_relationship() and _relationship_color
state. Phase 2 tests (name, tier hint) marked as skip placeholders.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Time display on InsertOverlay (CanvasLayer 10) shows station local
time (HH:MM), day phase with cycle-tinted color, and day number.
Reads SimulationTime from GameState.game_time via update_from_state().
Adds Constants.format_game_time() helper for testability.
Placeholder layout — position refines when #314 wireframe lands.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>