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/memory/harvest.rs

@@ -0,0 +1,114 @@
+//! Auto-memory harvest use case (Lot E1).
+//!
+//! [`HarvestMemoryFromTurn`] turns the text of a finished agent turn into persisted
+//! memory notes when it embeds ` ```idea-memory ` directives (parsed by the pure
+//! [`domain::memory_harvest`] module). It is **best-effort strict**: it only acts on
+//! a `Response` turn, parses **only the current turn's text** (never the full log),
+//! and never fails — parse/store errors are collected into the returned
+//! [`MemoryHarvestOutcome`] so the orchestrator can drop them without ever turning a
+//! successful reply/ticket/handoff into an error.
+
+use std::sync::Arc;
+
+use domain::conversation_log::TurnRole;
+use domain::ports::{EventBus, MemoryStore};
+use domain::{
+    parse_memory_directives, DomainEvent, MarkdownDoc, Memory, MemoryFrontmatter,
+    MemoryHarvestDirective, MemorySlug, ProjectPath,
+};
+
+/// The outcome of harvesting one turn: a report the caller may log or ignore.
+///
+/// `found` is the number of `idea-memory` directives the agent emitted; `saved`
+/// the slugs successfully persisted; `skipped` how many were dropped (parse or
+/// store failures); `errors` the human-readable reasons (parse + store).
+#[derive(Debug, Clone, PartialEq, Eq, Default)]
+pub struct MemoryHarvestOutcome {
+    /// Number of `idea-memory` directives detected in the turn text.
+    pub found: usize,
+    /// Slugs of the notes that were saved (and announced).
+    pub saved: Vec<MemorySlug>,
+    /// Number of directives dropped (invalid, over-limit, or store failure).
+    pub skipped: usize,
+    /// One message per dropped directive (parse + persistence reasons).
+    pub errors: Vec<String>,
+}
+
+/// Validates and persists the memory directives embedded in a finished turn.
+///
+/// Talks only to ports ([`MemoryStore`], [`EventBus`]); announces
+/// [`DomainEvent::MemorySaved`] per saved note like the manual CRUD use cases.
+pub struct HarvestMemoryFromTurn {
+    memories: Arc<dyn MemoryStore>,
+    events: Arc<dyn EventBus>,
+}
+
+impl HarvestMemoryFromTurn {
+    /// Builds the use case from its ports.
+    #[must_use]
+    pub fn new(memories: Arc<dyn MemoryStore>, events: Arc<dyn EventBus>) -> Self {
+        Self { memories, events }
+    }
+
+    /// Harvests `text` (the current turn's content) into `root`'s memory store.
+    ///
+    /// Best-effort: returns a [`MemoryHarvestOutcome`] and **never** an error. A
+    /// non-`Response` turn is a no-op (empty outcome) — prompts and tool activity
+    /// never carry harvest directives.
+    pub async fn harvest(
+        &self,
+        root: &ProjectPath,
+        role: TurnRole,
+        text: &str,
+    ) -> MemoryHarvestOutcome {
+        if role != TurnRole::Response {
+            return MemoryHarvestOutcome::default();
+        }
+        let report = parse_memory_directives(text);
+        let mut outcome = MemoryHarvestOutcome {
+            found: report.found,
+            // Parse-level skips are already final; store-level skips are added below.
+            skipped: report.errors.len(),
+            errors: report.errors,
+            saved: Vec::new(),
+        };
+        for directive in report.directives {
+            match self.persist(root, directive).await {
+                Ok(slug) => outcome.saved.push(slug),
+                Err(err) => {
+                    outcome.skipped += 1;
+                    outcome.errors.push(err);
+                }
+            }
+        }
+        outcome
+    }
+
+    /// Persists one validated directive and announces it, mapping the (today
+    /// title-less) [`Memory`] entity from the directive. Returns the saved slug or
+    /// a message on a build/store failure (never panics).
+    async fn persist(
+        &self,
+        root: &ProjectPath,
+        directive: MemoryHarvestDirective,
+    ) -> Result<MemorySlug, String> {
+        let slug = directive.slug.clone();
+        // The persisted `Memory` has no title field today; the directive's `title`
+        // is intentionally not stored separately (the index derives its title from
+        // the slug). See the Lot E1 report's écart note.
+        let frontmatter = MemoryFrontmatter {
+            name: slug.clone(),
+            description: directive.description,
+            r#type: directive.r#type,
+        };
+        let memory = Memory::new(frontmatter, MarkdownDoc::new(directive.body.as_str()))
+            .map_err(|e| format!("invalid memory {slug}: {e}"))?;
+        self.memories
+            .save(root, &memory)
+            .await
+            .map_err(|e| format!("store failed for {slug}: {e}"))?;
+        self.events
+            .publish(DomainEvent::MemorySaved { slug: slug.clone() });
+        Ok(slug)
+    }
+}

crates/application/src/memory/mod.rs

@@ -12,8 +12,11 @@
 //! [`UpdateMemory`], [`DeleteMemory`]) announce a [`domain::DomainEvent`]; the
 //! read use cases emit nothing.
 
+mod harvest;
 mod usecases;
 
+pub use harvest::{HarvestMemoryFromTurn, MemoryHarvestOutcome};
+
 pub use usecases::{
     CreateMemory, CreateMemoryInput, CreateMemoryOutput, DeleteMemory, DeleteMemoryInput,
     GetMemory, GetMemoryInput, GetMemoryOutput, ListMemories, ListMemoriesInput,