chore(wip): checkpoint P8/C avant chantier Codex inter-agents

Sauvegarde de l'arbre de travail en cours (persistance P8, conversations
C-series, write-portal frontend, médiation d'entrée) avant d'attaquer le
support de la délégation inter-agents pour les profils Codex.

Le round-trip inter-agent question/réponse est couvert sans tokens par
les tests loopback existants (state::mcp_e2e_loopback_tests).

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

frontend/src/adapters/mock/index.ts

@@ -1533,39 +1533,38 @@ export class MockEmbedderGateway implements EmbedderGateway {
   }
 }
 
-/** One recorded mediated-input call (for test assertions). */
+/** One recorded agent-input control call (for test assertions). */
 export interface MockInputCall {
   projectId: string;
   agentId: string;
-  /** Present for `submit`, absent for `interrupt`. */
-  text?: string;
+  /** Present for `delegationDelivered`, absent for `interrupt`. */
+  ticket?: string;
 }
 
 /**
- * In-memory {@link InputGateway} (lot F1). Records every `submit`/`interrupt`
- * so tests can assert the component routed through the port with the right
- * args — no backend. `submit` always resolves (the FIFO never refuses an
- * enqueue; the forward/fallback rule lives backend-side, §4.2/§6).
+ * In-memory {@link InputGateway} (ARCHITECTURE §20.3). Records every
+ * `interrupt`/`delegationDelivered` so tests can assert the component routed
+ * through the port with the right args — no backend.
  *
  * Exported so tests can instantiate it directly (same pattern as the other mocks).
  */
 export class MockInputGateway implements InputGateway {
-  /** All recorded submit calls, in order. */
-  readonly submits: MockInputCall[] = [];
   /** All recorded interrupt calls, in order. */
   readonly interrupts: MockInputCall[] = [];
-
-  async submit(
-    projectId: string,
-    agentId: string,
-    text: string,
-  ): Promise<void> {
-    this.submits.push({ projectId, agentId, text });
-  }
+  /** All recorded delegation-delivered acks, in order. */
+  readonly delivered: MockInputCall[] = [];
 
   async interrupt(projectId: string, agentId: string): Promise<void> {
     this.interrupts.push({ projectId, agentId });
   }
+
+  async delegationDelivered(
+    projectId: string,
+    agentId: string,
+    ticket: string,
+  ): Promise<void> {
+    this.delivered.push({ projectId, agentId, ticket });
+  }
 }
 
 /** Builds the full set of mock gateways. */