Critical fixes:
- hide_dialogue() sent PAUSE instead of UNPAUSE, permanently freezing
simulation after every dialogue (both reviewers)
- Confrontation monologue hardcoded in GDScript constant, violating
D-042/D-020 — moved to ui-strings.yaml as dialogue.confrontation_beat
- Walk-away WASD didn't call set_input_as_handled(), letting movement
event propagate and potentially stepping on the same frame
- is_dialogue_active() returned _is_showing only — interaction list
could flash during 300ms fade gap. Now includes dialogue_active state
- Removed dead _last_dialogue_id / get_dialogue_id() state (never read)
Warnings addressed:
- Audio registry now scans res://audio/ recursively (subdirs registered)
- add_bus_effect guarded against duplicate calls in tests
- int64 encoder dead code tagged KNOWN-DEFECT, filed as ticket #516
- D-073 zone crossfade stub comment clarifies Sprint 9+ deferral
- listening_focus dip documents caller tick-gate responsibility (D-069/D-071)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>