fix(backend,domain,infrastructure,frontend): réconcilie les états et tâches fantômes au démarrage — #307 (cause: l'activation projet balayait tous les documents background-task sous le root sans filtre project_id et LiveState::reconcile_orphans conservait correlation_id des lignes mortes, laissant après reboot des LED working fantômes et des tâches Running orphelines reprojetées par GetProjectWorkState, tandis qu'un conversationId isolé affichait indéfiniment « Conversation liée — récupération du transcript en cours. »; fix backend: FsBackgroundTaskStore::reconcile_project_boot borne la réconciliation boot au document du projet activé (API reconcile_boot historique préservée), AppBackgroundTaskStore filtre list_undelivered_completions sur project_id, et une ligne active orpheline efface désormais aussi correlation_id en plus de ticket/last_delegation; garde-fou frontend: CustomAgentChatView affiche l'état terminal « Conversation liée — transcript indisponible. » quand openOrAttach terminé n'a récupéré aucun tour, spinner borné à opening, conversationId et cellule préservés; QA verte reconfirmée par Git: rustup run stable cargo fmt --all -- --check, git diff --check, cargo test -p infrastructure --test background_task_store 12/12 dont project_reconcile_does_not_repair_or_report_foreign_project_tasks, -p domain --lib live_state 15/15, -p backend ticket307_activation_reconcile_tests 1/1 (activate_project_clears_stale_live_correlation_and_terminalizes_orphan_task) et background_tasks_b7 1/1 renforcé (orphan évicté de list_open_for_agent), -p application --test workstate 29/29, cargo check -p backend, frontend npm test CustomAgentChatView 72/72 dont garde-fou transcript indisponible, npm run typecheck; risque résiduel documenté: le garde-fou suppose que openOrAttach finit par se résoudre, pas de timeout transport ajouté; fichiers .ideai/tickets/296/*, tickets/299-307/*, counter/index, attachments/ et scripts/ hors périmètre et préservés en worktree; aucun push)

crates/backend/src/lib.rs

@@ -729,7 +729,12 @@ impl AppBackgroundTaskStore {
         project_id: ProjectId,
     ) -> Result<Vec<BackgroundTask>, BackgroundTaskPortError> {
         let store = self.store_for_project(project_id).await?;
-        let tasks = store.list_undelivered_completions().await?;
+        let tasks = store
+            .list_undelivered_completions()
+            .await?
+            .into_iter()
+            .filter(|task| task.project_id == project_id)
+            .collect::<Vec<_>>();
         for task in &tasks {
             self.remember(task.id, task.project_id);
         }
@@ -743,7 +748,9 @@ impl AppBackgroundTaskStore {
         now_ms: u64,
     ) -> Result<(), BackgroundTaskPortError> {
         let store = self.store_for_project(project_id).await?;
-        let report = store.reconcile_boot(live_task_ids, now_ms).await?;
+        let report = store
+            .reconcile_project_boot(project_id, live_task_ids, now_ms)
+            .await?;
         for task_id in report
             .failed_task_ids
             .into_iter()
@@ -5878,6 +5885,10 @@ mod background_tasks_b7_tests {
         let orphan_after = store.get(orphan.id).await.unwrap().unwrap();
         assert_eq!(orphan_after.state, BackgroundTaskState::Failed);
         assert!(orphan_after.has_pending_completion_delivery());
+        assert!(
+            store.list_open_for_agent(owner).await.unwrap().is_empty(),
+            "activation must evict the orphan from the open-task projection"
+        );
         assert!(matches!(
             orphan_after.result,
             Some(BackgroundTaskResult::Failure {
@@ -5888,6 +5899,116 @@ mod background_tasks_b7_tests {
     }
 }
 
+#[cfg(test)]
+mod ticket307_activation_reconcile_tests {
+    use std::path::{Path, PathBuf};
+
+    use application::CreateProjectInput;
+    use domain::ports::LiveStateStore;
+    use domain::{
+        AgentId, BackgroundTask, BackgroundTaskKind, BackgroundTaskState, BackgroundTaskWakePolicy,
+        LiveEntry, Project, ProjectPath, TaskId, WorkStatus,
+    };
+    use infrastructure::FsLiveStateStore;
+    use uuid::Uuid;
+
+    use super::BackendCore;
+
+    fn temp_path(tag: &str) -> PathBuf {
+        std::env::temp_dir().join(format!("idea-ticket307-{tag}-{}", Uuid::new_v4()))
+    }
+
+    async fn create_project(core: &BackendCore, root: &Path) -> Project {
+        core.create_project
+            .execute(CreateProjectInput {
+                name: "ticket-307".to_owned(),
+                root: root.to_string_lossy().into_owned(),
+                remote: None,
+                default_profile_id: None,
+            })
+            .await
+            .expect("project creation succeeds")
+            .project
+    }
+
+    #[tokio::test]
+    async fn activate_project_clears_stale_live_correlation_and_terminalizes_orphan_task() {
+        let app_data = temp_path("appdata");
+        let root = temp_path("project");
+        let core = BackendCore::build(app_data.clone());
+        let project = create_project(&core, &root).await;
+        let owner = AgentId::from_uuid(Uuid::from_u128(307));
+
+        let live_store =
+            FsLiveStateStore::new(&ProjectPath::new(root.to_string_lossy().into_owned()).unwrap());
+        live_store
+            .upsert(
+                LiveEntry::new(
+                    owner,
+                    None,
+                    "stale startup work",
+                    WorkStatus::Working,
+                    None,
+                    None,
+                    1_000,
+                )
+                .unwrap()
+                .with_correlation_id(Some("stale-correlation".to_owned()))
+                .unwrap(),
+            )
+            .await
+            .unwrap();
+
+        let task = BackgroundTask::new(
+            TaskId::from_uuid(Uuid::from_u128(308)),
+            project.id,
+            owner,
+            BackgroundTaskKind::Command {
+                label: "stale startup task".to_owned(),
+            },
+            BackgroundTaskWakePolicy::RecordOnly,
+            1_000,
+            None,
+        )
+        .unwrap()
+        .transition(BackgroundTaskState::Running, 1_001)
+        .unwrap();
+        core.background_task_store.create(&task).await.unwrap();
+
+        core.activate_project(&project).await;
+
+        let state = live_store.load().await.unwrap();
+        let row = state
+            .entries
+            .iter()
+            .find(|entry| entry.agent_id == owner)
+            .unwrap();
+        assert_eq!(row.status, WorkStatus::Idle);
+        assert_eq!(row.correlation_id, None);
+        assert_eq!(row.ticket, None);
+        assert_eq!(row.last_delegation, None);
+
+        let task_after = core
+            .background_task_store
+            .get(task.id)
+            .await
+            .unwrap()
+            .unwrap();
+        assert_eq!(task_after.state, BackgroundTaskState::Failed);
+        assert!(
+            core.background_task_store
+                .list_open_for_agent(owner)
+                .await
+                .unwrap()
+                .is_empty(),
+            "GetProjectWorkState's open-task source must not see the orphan after activation"
+        );
+
+        let _ = std::fs::remove_dir_all(app_data);
+        let _ = std::fs::remove_dir_all(root);
+    }
+}
+
 #[cfg(test)]
 mod mcp_serve_peer_tests {
     //! M5c — server side of the bind transport: [`serve_peer`] + [`parse_handshake`].

crates/domain/src/live_state.rs

@@ -226,8 +226,9 @@ impl LiveState {
     /// "ghost" rows for agents whose sessions are dead. This pure transform returns
     /// the **rewritten** rows to upsert (it does **not** mutate `self`): each orphan
     /// is downgraded to [`WorkStatus::Idle`], keeping its `intent` (trace), clearing
-    /// the now-dead `ticket` and `last_delegation`, stamping a `progress` stale
+    /// the now-dead `ticket`, `last_delegation` and `correlation_id`, stamping a
-    /// marker and a fresh `updated_at_ms = now_ms` (last-writer-wins).
+    /// `progress` stale marker and a fresh `updated_at_ms = now_ms`
+    /// (last-writer-wins).
     ///
     /// Rows that are already `Idle`/`Done`, or whose agent is still live, are
     /// **never** touched and are absent from the result. The caller persists each
@@ -253,7 +254,10 @@ impl LiveState {
                 status: WorkStatus::Idle,
                 progress: Some(STALE_AT_RESTART_MARKER.to_owned()),
                 last_delegation: None,
-                correlation_id: e.correlation_id.clone(),
+                // A correlation identifies an active cross-project request. If
+                // the owning session is gone, retaining it would keep exposing a
+                // relationship that no runtime can resume or cancel.
+                correlation_id: None,
                 updated_at_ms: now_ms,
             })
             .collect()
@@ -451,6 +455,8 @@ mod tests {
                 Some(tid(8)),
                 100,
             )
+            .unwrap()
+            .with_correlation_id(Some("cross-project-request".to_owned()))
             .unwrap(),
         );
 
@@ -468,6 +474,7 @@ mod tests {
         assert_eq!(row.intent, "implementing lot 2", "intent kept as trace");
         assert_eq!(row.ticket, None, "dead ticket cleared");
         assert_eq!(row.last_delegation, None, "dead delegation cleared");
+        assert_eq!(row.correlation_id, None, "dead correlation cleared");
         assert_eq!(row.progress.as_deref(), Some(STALE_AT_RESTART_MARKER));
         assert_eq!(row.updated_at_ms, 999, "stamped with the fresh now");
     }

crates/infrastructure/src/store/background_task.rs

@@ -120,6 +120,31 @@ impl FsBackgroundTaskStore {
         &self,
         live_task_ids: &[TaskId],
         now_ms: u64,
+    ) -> Result<BackgroundTaskReconcileReport, BackgroundTaskPortError> {
+        self.reconcile_boot_inner(None, live_task_ids, now_ms).await
+    }
+
+    /// Reconciles only the document owned by `project_id`.
+    ///
+    /// The filesystem adapter is normally rooted at one project, but documents
+    /// remain keyed by project id. Activation must therefore stay explicitly
+    /// project-scoped and must not repair or report a foreign/stale document that
+    /// happens to exist below the same root.
+    pub async fn reconcile_project_boot(
+        &self,
+        project_id: ProjectId,
+        live_task_ids: &[TaskId],
+        now_ms: u64,
+    ) -> Result<BackgroundTaskReconcileReport, BackgroundTaskPortError> {
+        self.reconcile_boot_inner(Some(project_id), live_task_ids, now_ms)
+            .await
+    }
+
+    async fn reconcile_boot_inner(
+        &self,
+        only_project_id: Option<ProjectId>,
+        live_task_ids: &[TaskId],
+        now_ms: u64,
     ) -> Result<BackgroundTaskReconcileReport, BackgroundTaskPortError> {
         let live: HashSet<TaskId> = live_task_ids.iter().copied().collect();
         let mut state = self.read_all_docs().await?;
@@ -127,6 +152,9 @@ impl FsBackgroundTaskStore {
         let mut changed_projects = BTreeSet::new();
 
         for (project_id, doc) in &mut state.docs {
+            if only_project_id.is_some_and(|expected| expected != *project_id) {
+                continue;
+            }
             for task in &mut doc.tasks {
                 match task.state {
                     BackgroundTaskState::Running

crates/infrastructure/tests/background_task_store.rs

@@ -381,6 +381,34 @@ async fn reconcile_marks_running_without_live_handle_failed_and_pending() {
     );
 }
 
+#[tokio::test]
+async fn project_reconcile_does_not_repair_or_report_foreign_project_tasks() {
+    let tmp = TempDir::new();
+    let store = FsBackgroundTaskStore::new(&tmp.project_path());
+    let owned = running_task(1, 10, 100, 1_000);
+    let foreign = running_task(2, 20, 100, 1_000);
+
+    store.create(&owned).await.unwrap();
+    store.create(&foreign).await.unwrap();
+
+    let report = store
+        .reconcile_project_boot(owned.project_id, &[], 2_000)
+        .await
+        .unwrap();
+
+    assert_eq!(report.failed_task_ids, vec![owned.id]);
+    assert_eq!(report.delivery_pending_task_ids, vec![owned.id]);
+    assert_eq!(
+        store.get(owned.id).await.unwrap().unwrap().state,
+        BackgroundTaskState::Failed
+    );
+    assert_eq!(
+        store.get(foreign.id).await.unwrap().unwrap().state,
+        BackgroundTaskState::Running,
+        "activating one project must not mutate another project's persisted task"
+    );
+}
+
 #[tokio::test]
 async fn reconcile_marks_cancelling_without_live_handle_cancel_failed_and_pending() {
     let tmp = TempDir::new();

frontend/src/features/agents/CustomAgentChatView.test.tsx

@@ -197,6 +197,57 @@ describe("CustomAgentChatView", () => {
     __resetProjectCliInteractionActivityForTests();
   });
 
+  it("settles an isolated conversation id without recovered turns as unavailable", async () => {
+    const agent = {
+      launchAgentChat: vi.fn(async () => ({ sessionId: "fresh-session" })),
+      reattachAgentChat: vi.fn(async (sessionId: string) => ({
+        sessionId,
+        scrollback: [],
+      })),
+      sendAgentChat: vi.fn(async () => {}),
+      cancelAgentChat: vi.fn(async () => {}),
+      closeAgentChat: vi.fn(async () => {}),
+    };
+
+    render(
+      <DIProvider
+        gateways={{
+          agent,
+          system: { pickFile: vi.fn(async () => null) },
+        } as unknown as Gateways}
+      >
+        <CustomAgentChatView
+          projectId="project-1"
+          agentId="agent-1"
+          agentName="Worker"
+          profile={profile}
+          cwd="/repo"
+          nodeId="node-1"
+          sessionId={null}
+          conversationId="orphan-conversation"
+          onSessionId={vi.fn()}
+          onConversationId={vi.fn()}
+        />
+      </DIProvider>,
+    );
+
+    await waitFor(() =>
+      expect(agent.launchAgentChat).toHaveBeenCalledWith(
+        "project-1",
+        "agent-1",
+        expect.objectContaining({ conversationId: "orphan-conversation" }),
+      ),
+    );
+    expect(
+      await screen.findByText("Conversation liée — transcript indisponible."),
+    ).toBeTruthy();
+    expect(
+      screen.queryByText("Conversation liée — récupération du transcript en cours."),
+    ).toBeNull();
+    expect(screen.queryByRole("progressbar")).toBeNull();
+    expect(screen.queryByRole("button", { name: "Réessayer" })).toBeNull();
+  });
+
   it("projects self-restart lifecycle separators in the custom CLI only once", async () => {
     const system = new MockSystemGateway();
     const agent = {

frontend/src/features/agents/CustomAgentChatView.tsx

@@ -2504,7 +2504,7 @@ export function CustomAgentChatView({
           </div>
         ) : displayTurns.length === 0 && hasLinkedConversation ? (
           <p className="m-auto text-xs text-muted">
-            Conversation liée — récupération du transcript en cours.
+            Conversation liée — transcript indisponible.
           </p>
         ) : displayTurns.length === 0 ? (
           <p className="m-auto text-xs text-muted">