Replace 3 direct GameState.dialogue_active mutations and all
AudioManager.apply_dip/clear_dip calls with signals:
dialogue_state_changed, audio_dip_requested, audio_dip_cleared.
dialogue_box.gd now has zero references to GameState or AudioManager.
main.gd wires coordinator handlers in _ready() (D-020).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
50 tests across two files: 30 dialogue tests (D-062 compliance,
D-063 confrontation beat, D-064 walk-away, BBCode guard, size
constraints) and 20 journal tests (KG parsing, confidence/source/
state enums, scene structure, UIStrings keys, POI list). Test plan
document with manual procedures and sprint completion checklist.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>