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>
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//! Memory use cases (ARCHITECTURE §14.5.1; LOT A, étage 1: `.md`).
//!
//! The memory module owns the CRUD of a project's persistent knowledge base —
//! one Markdown note per [`domain::memory::Memory`], stored under
//! `.ideai/memory/<slug>.md` with a derived `MEMORY.md` index. On top of the
//! CRUD it exposes two read-only navigation helpers driving the graphical memory
//! view: [`ReadMemoryIndex`] (the structured index) and [`ResolveMemoryLinks`]
//! (a note's resolved `[[slug]]` outgoing links, broken links dropped).
//!
//! Every use case talks only to ports ([`domain::ports::MemoryStore`],
//! [`domain::ports::EventBus`]). Mutating use cases ([`CreateMemory`],
//! [`UpdateMemory`], [`DeleteMemory`]) announce a [`domain::DomainEvent`]; the
//! read use cases emit nothing.
mod usecases;
pub use usecases::{
CreateMemory, CreateMemoryInput, CreateMemoryOutput, DeleteMemory, DeleteMemoryInput,
GetMemory, GetMemoryInput, GetMemoryOutput, ListMemories, ListMemoriesInput, ListMemoriesOutput,
ReadMemoryIndex, ReadMemoryIndexInput, ReadMemoryIndexOutput, RecallMemory, RecallMemoryInput,
RecallMemoryOutput, ResolveMemoryLinks, ResolveMemoryLinksInput, ResolveMemoryLinksOutput,
UpdateMemory, UpdateMemoryInput, UpdateMemoryOutput,
};