The live GDScript turn emitted `golden_age_started`/`golden_age_ended` inline;
the headless happiness phase flipped `golden_age_active` silently. Detect the
false→true / true→false edge in `process_happiness_phase`, buffer it into a new
transient `GameState.pending_golden_age_events` (registry-has-no-event-sink
pattern), and drain it in `step()` into `GoldenAgeStarted`/`GoldenAgeEnded`.
Both edges emitted since the live UI consumes both signals (event_bus.gd). No
wire surface — dispatch drops them; live UI reads the kind-tagged event_to_dict.
Verified headless: mc-replay 20/0 (golden_age_events_serde), mc-turn 291/0
(golden_age_start_edge_buffers_started_event +
golden_age_end_edge_buffers_ended_event + event_collector_wiring).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
a87ea9f4d4