feat(terminals): reprise de conversation par cellule + fix ordre d'écriture

Permet de recharger la conversation CLI précédente de chaque cellule à la
réouverture du projet, de façon universelle (indépendant du modèle/CLI).

- profil AgentRuntime: bloc déclaratif optionnel `session { assignFlag, resumeFlag }`
- LeafCell: `conversationId` (persistant, distinct du SessionId PTY) + `agentWasRunning`
- runtime: SessionPlan (None/Assign/Resume) + composition pure des args
- LaunchAgent: décide Assign vs Resume, génère l'UUID, remonte l'id assigné
  (persistance par l'appelant via setCellConversation — découplage SRP)
- close: SnapshotRunningAgents fige `agentWasRunning` avant le kill-all
  (statut clot/en cours universel, sans parsing CLI)
- SessionInspector: port optionnel best-effort + adapter ClaudeTranscriptInspector
- popup de reprise par cellule (statut + sujet/tokens si dispo), intercalée
  avant le Resume auto, jamais sur le chemin reattach

fix(terminals): sérialise les écritures PTY (file FIFO par handle) — corrige
les caractères mélangés/accents dus au réordonnancement des invoke Tauri concurrents

fix(layout): l'opération `move` préservait mal les champs du leaf (perdait `agent`)

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

frontend/src/domain/index.ts

@@ -62,11 +62,17 @@ export interface GatewayError {
 export type Direction = "row" | "column";
 
 /** A terminal-hosting leaf cell. `session` is the hosted SessionId, if any.
- * `agent` is the agent id if an agent is pinned to this cell (absent = plain terminal). */
+ * `agent` is the agent id if an agent is pinned to this cell (absent = plain terminal).
+ * `conversationId` is the persistent CLI conversation id (survives PTY close/reopen,
+ * lets the agent resume); omitted when absent (mirrors the backend `skip_serializing_if`).
+ * `agentWasRunning` records whether the cell's agent process was running at close time;
+ * omitted when `false`. */
 export interface LeafCell {
   id: string;
   session?: string | null;
   agent?: string;
+  conversationId?: string;
+  agentWasRunning?: boolean;
 }
 
 /** A weighted child of a split. `weight` is a relative (`> 0`) share. */
@@ -129,7 +135,9 @@ export type LayoutOperation =
   | { type: "resize"; container: string; weights: number[] }
   | { type: "move"; from: string; to: string }
   | { type: "setSession"; target: string; session?: string | null }
-  | { type: "setCellAgent"; target: string; agent: string | null };
+  | { type: "setCellAgent"; target: string; agent: string | null }
+  | { type: "setCellConversation"; target: string; conversationId: string | null }
+  | { type: "setAgentRunning"; target: string; running: boolean };
 
 /** The kind of a named layout. */
 export type LayoutKind = "terminal" | "gitGraph";
@@ -197,6 +205,9 @@ export interface AgentProfile {
   contextInjection: ContextInjection;
   detect: string | null;
   cwdTemplate: string;
+  /** Optional CLI flags for agent-session continuity: `assignFlag` to bind a
+   * conversation id at launch, `resumeFlag` to resume an existing conversation. */
+  session?: { assignFlag?: string; resumeFlag: string };
 }
 
 /** Availability of a candidate profile after detection (mirror of the DTO). */