feat(memory): récolte automatique contrôlée de la mémoire (Lot E1)

Câble la récolte automatique de mémoire de bout en bout, sous contrôle
explicite, du domaine jusqu'à l'UI :

- domain : modèle `memory_harvest` (candidats de récolte, décision) +
  exports `lib.rs`.
- application : use case `memory/harvest` branché dans `memory/mod`,
  `lib.rs`, le cycle de vie d'agent (`agent/lifecycle`) et
  l'orchestrateur (`orchestrator/service`).
- app-tauri : wiring runtime dans `state`.
- frontend : DTO `domain/index` + hook `useMemory`.

Couverture : domain `memory_harvest` (14), application `memory_harvest`
(5) et `orchestrator_service` (récolte, 4), plus patch test-only du mock
gateway `workState` (`mock.test.ts`) et UI `memory.test`.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

crates/application/src/lib.rs

@@ -74,10 +74,11 @@ pub use layout::{
 };
 pub use memory::{
     CreateMemory, CreateMemoryInput, CreateMemoryOutput, DeleteMemory, DeleteMemoryInput,
-    GetMemory, GetMemoryInput, GetMemoryOutput, ListMemories, ListMemoriesInput,
-    ListMemoriesOutput, ReadMemoryIndex, ReadMemoryIndexInput, ReadMemoryIndexOutput, RecallMemory,
-    RecallMemoryInput, RecallMemoryOutput, ResolveMemoryLinks, ResolveMemoryLinksInput,
-    ResolveMemoryLinksOutput, UpdateMemory, UpdateMemoryInput, UpdateMemoryOutput,
+    GetMemory, GetMemoryInput, GetMemoryOutput, HarvestMemoryFromTurn, ListMemories,
+    ListMemoriesInput, ListMemoriesOutput, MemoryHarvestOutcome, ReadMemoryIndex,
+    ReadMemoryIndexInput, ReadMemoryIndexOutput, RecallMemory, RecallMemoryInput,
+    RecallMemoryOutput, ResolveMemoryLinks, ResolveMemoryLinksInput, ResolveMemoryLinksOutput,
+    UpdateMemory, UpdateMemoryInput, UpdateMemoryOutput,
 };
 pub use orchestrator::{
     ContextGuardUseCases, McpRuntimeProvider, OrchestratorOutcome, OrchestratorService,