refactor(agent): complete inbox lifecycle migration

packages/host/apiproxy/tests/rpc-schemas.spec.ts

@@ -421,7 +421,11 @@ describe('events frame schemas', () => {
       { type: 'question/requested', sessionId: 's', questions: [{ id: 'q', question: 'Q?', options: [{ label: 'L' }], multiSelect: true }] },
       { type: 'question/resolved', sessionId: 's', questionRpcId: 'r', outcome: 'answered' },
       { type: 'session/queue', sessionId: 's', items: [
-        { id: 'm1', role: 'user', content: [{ type: 'text', text: 'queued prompt' }], source: { kind: 'user', rpcId: 'r9' } },
+        {
+          id: 'm1',
+          placement: 'queued',
+          message: { id: 'm1', role: 'user', content: [{ type: 'text', text: 'queued prompt' }], source: { kind: 'user', rpcId: 'r9' } },
+        },
       ] },
       { type: 'session/projection', sessionId: 's', key: 'todos', value: [{ content: 'x', status: 'pending' }], seq: 7 },
       { type: 'stream/error', error: { code: 'internal', message: 'm', details: {} } },