feat(orchestrator): durcir le rendez-vous inter-agents + backstop no-reply (Finding A)

Corrige le wedge survenant lorsqu'un agent délégué ne rappelle pas idea_reply :
le rendez-vous ask_agent ne reste plus bloqué indéfiniment.

Lot 1 — durcissement du préambule de délégation :
- input/mod.rs : delegation_preamble renforcé (obligation explicite idea_reply).
- agent/lifecycle.rs : préambule injecté conditionné à mcp_enabled.

Lot 2 — peuplement du prompt_ready_pattern :
- agent/catalogue.rs : .with_prompt_ready_pattern("? for shortcuts") sur le
  profil Claude + tests de seed, pour calibrer la détection de grâce.

Lot 3 — backstop timeout serveur :
- mcp/jsonrpc.rs : code d'erreur typé RENDEZVOUS_NO_REPLY (-32001).
- mcp/server.rs : mapping timeout → erreur typée, with_ask_rendezvous_timeout
  promu + resolve_ask_rendezvous_timeout (configurable).
- app-tauri/state.rs : lecture env IDEA_ASK_RENDEZVOUS_TIMEOUT_MS.
- tests/mcp_server.rs mis à jour, fix d'un test input flaky.

Propagation overlay (référence des profils) :
- agent/catalogue.rs : overlay_reference_defaults + reference_index + tests.
- store/profile.rs : ReferenceBackfillProfileStore + tests.
- app-tauri/state.rs : wrap au composition root.
- exports mod.rs / lib.rs (application + infrastructure).

Tests réels verts : application 494, app-tauri 235, infrastructure 248,
mcp_server 22/22, 0 échec. Validation e2e LIVE (rebuild AppImage) en attente
avant merge vers develop.

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

crates/infrastructure/src/store/profile.rs

@@ -148,6 +148,59 @@ impl ProfileStore for FsProfileStore {
     }
 }
 
+/// **Merge-on-read decorator** over any [`ProfileStore`]: backfills *internal*
+/// reference defaults that a stored profile is missing, without ever persisting
+/// anything (finding A — propagate the measured `prompt_ready_pattern` to profiles
+/// saved before that field existed).
+///
+/// Only [`list`](ProfileStore::list) is transformed — each returned profile is run
+/// through [`application::overlay_reference_defaults`] (pure, allowlisted, never
+/// clobbers a user value, idempotent). `save`/`delete`/`is_configured`/
+/// `mark_configured` **delegate verbatim** so persistence and first-run detection are
+/// byte-for-byte unchanged. Wrap the concrete [`FsProfileStore`] once at the
+/// composition root, before injecting the store into use cases and the orchestrator,
+/// so every reader (including direct `.list()` calls) sees the overlaid reads.
+pub struct ReferenceBackfillProfileStore {
+    inner: Arc<dyn ProfileStore>,
+}
+
+impl ReferenceBackfillProfileStore {
+    /// Wraps an inner [`ProfileStore`]; reads are overlaid, writes pass through.
+    #[must_use]
+    pub fn new(inner: Arc<dyn ProfileStore>) -> Self {
+        Self { inner }
+    }
+}
+
+#[async_trait]
+impl ProfileStore for ReferenceBackfillProfileStore {
+    async fn list(&self) -> Result<Vec<AgentProfile>, StoreError> {
+        Ok(self
+            .inner
+            .list()
+            .await?
+            .into_iter()
+            .map(|p| application::overlay_reference_defaults(&p))
+            .collect())
+    }
+
+    async fn save(&self, profile: &AgentProfile) -> Result<(), StoreError> {
+        self.inner.save(profile).await
+    }
+
+    async fn delete(&self, id: ProfileId) -> Result<(), StoreError> {
+        self.inner.delete(id).await
+    }
+
+    async fn is_configured(&self) -> Result<bool, StoreError> {
+        self.inner.is_configured().await
+    }
+
+    async fn mark_configured(&self) -> Result<(), StoreError> {
+        self.inner.mark_configured().await
+    }
+}
+
 // ---------------------------------------------------------------------------
 // FsEmbedderProfileStore — declarative embedder profiles (`embedder.json`, LOT C).
 // ---------------------------------------------------------------------------
@@ -286,3 +339,88 @@ impl EmbedderProfileStore for FsEmbedderProfileStore {
         FsEmbedderProfileStore::delete(self, id).await
     }
 }
+
+#[cfg(test)]
+mod backfill_tests {
+    use super::*;
+    use std::sync::Mutex;
+
+    /// In-memory [`ProfileStore`] fake recording mutating/query calls, so we can prove
+    /// the decorator transforms ONLY `list` and delegates the rest verbatim.
+    #[derive(Default)]
+    struct FakeStore {
+        profiles: Mutex<Vec<AgentProfile>>,
+        saved: Mutex<Vec<AgentProfile>>,
+        deleted: Mutex<Vec<ProfileId>>,
+        is_configured_calls: Mutex<u32>,
+        mark_configured_calls: Mutex<u32>,
+    }
+
+    #[async_trait]
+    impl ProfileStore for FakeStore {
+        async fn list(&self) -> Result<Vec<AgentProfile>, StoreError> {
+            Ok(self.profiles.lock().unwrap().clone())
+        }
+        async fn save(&self, profile: &AgentProfile) -> Result<(), StoreError> {
+            self.saved.lock().unwrap().push(profile.clone());
+            Ok(())
+        }
+        async fn delete(&self, id: ProfileId) -> Result<(), StoreError> {
+            self.deleted.lock().unwrap().push(id);
+            Ok(())
+        }
+        async fn is_configured(&self) -> Result<bool, StoreError> {
+            *self.is_configured_calls.lock().unwrap() += 1;
+            Ok(true)
+        }
+        async fn mark_configured(&self) -> Result<(), StoreError> {
+            *self.mark_configured_calls.lock().unwrap() += 1;
+            Ok(())
+        }
+    }
+
+    /// Claude reference profile with the internal field cleared — the persisted-before
+    /// shape the overlay backfills.
+    fn claude_without_pattern() -> AgentProfile {
+        let id = application::reference_profile_id("claude");
+        let mut p = application::reference_profiles()
+            .into_iter()
+            .find(|p| p.id == id)
+            .expect("claude reference exists");
+        p.prompt_ready_pattern = None;
+        p
+    }
+
+    #[tokio::test]
+    async fn list_overlays_reference_defaults() {
+        let fake = Arc::new(FakeStore::default());
+        fake.profiles.lock().unwrap().push(claude_without_pattern());
+        let store = ReferenceBackfillProfileStore::new(Arc::clone(&fake) as Arc<dyn ProfileStore>);
+
+        let listed = store.list().await.expect("list ok");
+        assert_eq!(listed.len(), 1);
+        assert_eq!(
+            listed[0].prompt_ready_pattern.as_deref(),
+            Some("? for shortcuts"),
+            "a stored Claude profile WITHOUT the pattern is backfilled on read"
+        );
+    }
+
+    #[tokio::test]
+    async fn save_delete_and_config_delegate_verbatim() {
+        let fake = Arc::new(FakeStore::default());
+        let store = ReferenceBackfillProfileStore::new(Arc::clone(&fake) as Arc<dyn ProfileStore>);
+
+        let p = claude_without_pattern();
+        store.save(&p).await.expect("save ok");
+        store.delete(p.id).await.expect("delete ok");
+        assert!(store.is_configured().await.expect("is_configured ok"));
+        store.mark_configured().await.expect("mark_configured ok");
+
+        // save passes the profile through UNCHANGED (no overlay on the write path).
+        assert_eq!(*fake.saved.lock().unwrap(), vec![p.clone()]);
+        assert_eq!(*fake.deleted.lock().unwrap(), vec![p.id]);
+        assert_eq!(*fake.is_configured_calls.lock().unwrap(), 1);
+        assert_eq!(*fake.mark_configured_calls.lock().unwrap(), 1);
+    }
+}