The live GDScript turn emitted `culture_researched` inline; the headless
Rust turn dropped tradition completions. Emit a `TurnEvent::CultureResearched`
at the completion site in `process_culture_research` (single-source per Rail-1),
translate it to the existing `wire::Event::CultureResearched` in dispatch (not
dropped), and surface it as a kind-tagged dict in `event_to_dict` so the live
turn_manager will receive it at the Rail-1 swap. Threaded the events sink into
the phase + both call sites.
Verified headless: mc-replay 18/0 (culture_researched_serde), mc-turn 287/0
(event_collector_wiring), mc-player-api 138/0.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>