feat(agent): UI hot-swap de profil (A2) — commande Tauri + sélecteur + dialog

- Tauri : commande change_agent_profile + ChangeAgentProfileRequestDto/Dto
  (camelCase, relaunchedSession omis si None), câblage state.rs par composition.
- Front : gateway changeAgentProfile (adapters Tauri+mock), sélecteur de profil
  par agent, dialog de confirmation FR (« Changer le moteur abandonne l'historique
  de conversation… »), refresh sur event agentProfileChanged.

Tests : app-tauri dto 5/5 ; vitest 314/314 (mapping, payload, dialog gating,
libellé FR, refresh). 0 régression.

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

frontend/src/domain/index.ts

@@ -18,6 +18,7 @@ export type DomainEvent =
   | { type: "projectCreated"; projectId: string }
   | { type: "agentLaunched"; agentId: string; sessionId: string }
   | { type: "agentExited"; agentId: string; code: number }
+  | { type: "agentProfileChanged"; agentId: string; profileId: string }
   | { type: "templateUpdated"; templateId: string; version: number }
   | { type: "agentDriftDetected"; agentId: string; from: number; to: number }
   | { type: "agentSynced"; agentId: string; to: number }
@@ -251,6 +252,27 @@ export interface Agent {
   skills: SkillRef[];
 }
 
+/**
+ * A terminal/PTY session as returned by the backend (mirror of
+ * `TerminalSessionDto`, camelCase wire format). Surfaced by `changeAgentProfile`
+ * as the freshly relaunched session when a live agent was hot-swapped.
+ */
+export interface TerminalSession {
+  /** Stable session id (UUID) — used for write/resize/close + the output channel. */
+  sessionId: string;
+  /** Working directory the shell runs in. */
+  cwd: string;
+  /** Current rows. */
+  rows: number;
+  /** Current cols. */
+  cols: number;
+  /**
+   * Conversation id assigned by this (re)launch, when the profile supports
+   * session assignment and the hosting cell had none yet; absent otherwise.
+   */
+  assignedConversationId?: string;
+}
+
 // ---------------------------------------------------------------------------
 // Skills (L12) — mirror of the domain `Skill` / `SkillRef`.
 // ---------------------------------------------------------------------------