docs(@projects): ✅ update unit action capability registry status

Co-Authored-By: Lilith Autocommit <noreply@atlilith.com>

.project/objectives/p1-20-unit-action-capability-registry.md

@@ -4,16 +4,23 @@ title: Unit action capability registry — one source of truth for "what can thi
 priority: p1
 scope: game1
 owner: wireguard
-status: stub
-updated_at: 2026-04-18
+status: done
+updated_at: 2026-04-19
 evidence:
+  - src/simulator/crates/mc-core/src/action.rs
+  - src/simulator/crates/mc-turn/src/action.rs
+  - src/simulator/crates/mc-turn/src/action_handlers.rs
+  - src/simulator/api-gdext/src/action.rs
   - src/game/engine/scenes/hud/unit_panel.gd
+  - src/game/engine/scenes/hud/unit_panel.tscn
+  - src/game/engine/scenes/hud/action_button.tscn
   - src/game/engine/src/entities/unit.gd
-  - src/simulator/crates/mc-sim/src/lib.rs
-  - src/simulator/crates/mc-turn/src/processor.rs
+  - src/game/engine/src/autoloads/data_loader.gd
+  - src/game/engine/tests/unit/entities/test_unit_actions.gd
   - src/simulator/crates/mc-ai/src/tactical/movement.rs
-  - src/simulator/api-gdext/src/ai.rs
+  - public/games/age-of-dwarves/data/unit_actions.json
   - public/games/age-of-dwarves/data/units/archer.json
+  - public/games/age-of-dwarves/vocabulary.json
 ---
 
 ## Summary