The live GDScript turn emitted `unit_healed` inline; the headless healing
phase recovered HP silently. The healing phase runs in the end-of-turn
`fn(&mut GameState)` registry (no event sink), so follow the FloraSuccession
buffer pattern: stash `(player, unit_id, applied_amount, col, row)` into a new
transient `GameState.pending_heal_events`, drain it in `step()` into
`TurnEvent::UnitHealed`. The buffered amount is the CLAMPED delta actually
applied (not the nominal heal rate). No wire surface — dispatch drops it; the
live UI consumes it via the kind-tagged `event_to_dict` dict.
Verified headless: mc-replay 19/0 (unit_healed_serde), mc-turn 289/0
(healing_buffers_unit_heal_event_with_applied_amount +
healing_buffers_clamped_amount_near_full_hp + event_collector_wiring).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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