feat(memory): système de mémoire projet model-agnostic (L14, LOT A+B+C)

Base de connaissance persistante par projet, indépendante de tout modèle/CLU
et de git. Cadrage archi en §14.5 (ARCHITECTURE.md), cycle Archi→Dev→Test.

LOT A — étage 1 (.md, source de vérité)
  - domaine: entité Memory (+ MemorySlug, MemoryType, MemoryFrontmatter,
    MemoryLink, MemoryIndexEntry), liens [[slug]], index MEMORY.md dérivé
  - port MemoryStore + MemoryError, adapter FsMemoryStore (.ideai/memory/)
  - application: 7 use cases (Create/Update/List/Get/Delete/ReadIndex/
    ResolveLinks), From<MemoryError> for AppError
  - app-tauri: commandes + DTO, events MemorySaved/MemoryDeleted
  - suppression de la variante morte DomainError::MalformedFrontmatter

LOT B — rappel adaptatif (étage 1)
  - port MemoryRecall + MemoryQuery, adapter NaiveMemoryRecall (troncature
    au budget de tokens, court-circuit budget-0), use case RecallMemory

LOT C — étage 2 vectoriel (structure complète, zéro dépendance lourde)
  - port Embedder + EmbedderError, profils déclaratifs EmbedderProfile/
    EmbedderStrategy (embedder.json)
  - VectorMemoryRecall (cosinus, cache .ideai/memory/.index/ gitignoré)
  - AdaptiveMemoryRecall (bascule pure should_use_vector), défaut none
  - HashEmbedder (déterministe, tests), StubEmbedder (onnx/server/api)

Tests: 57 binaires verts, build + clippy --workspace sans warning.

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

crates/app-tauri/src/events.rs

@@ -111,6 +111,24 @@ pub enum DomainEventDto {
         /// Whether IdeA handled it successfully.
         ok: bool,
     },
+    /// A memory note was created or updated.
+    #[serde(rename_all = "camelCase")]
+    MemorySaved {
+        /// The saved note's slug.
+        slug: String,
+    },
+    /// A memory note was deleted.
+    #[serde(rename_all = "camelCase")]
+    MemoryDeleted {
+        /// The deleted note's slug.
+        slug: String,
+    },
+    /// The aggregated `MEMORY.md` index was rebuilt.
+    #[serde(rename_all = "camelCase")]
+    MemoryIndexRebuilt {
+        /// Project id.
+        project_id: String,
+    },
     /// Raw PTY output (normally routed to a per-session channel, not here).
     #[serde(rename_all = "camelCase")]
     PtyOutput {
@@ -185,6 +203,15 @@ impl From<&DomainEvent> for DomainEventDto {
                 action: action.clone(),
                 ok: *ok,
             },
+            DomainEvent::MemorySaved { slug } => Self::MemorySaved {
+                slug: slug.as_str().to_string(),
+            },
+            DomainEvent::MemoryDeleted { slug } => Self::MemoryDeleted {
+                slug: slug.as_str().to_string(),
+            },
+            DomainEvent::MemoryIndexRebuilt { project_id } => Self::MemoryIndexRebuilt {
+                project_id: project_id.to_string(),
+            },
             DomainEvent::PtyOutput { session_id, bytes } => Self::PtyOutput {
                 session_id: session_id.to_string(),
                 bytes: bytes.clone(),