fix(agent): restore public send method

packages/goal/command-goal/tests/command-goal.spec.ts

@@ -37,6 +37,7 @@ function stubAgent(ctx: Context, id: string): { agent: Agent; session: Session }
     inbox: new Inbox(session),
     ctx: new Context(),
     get status() { return status },
+    send: () => {},
     followup: () => {},
     steer: () => {},
     inject(input) { appendInjection(session, input) },

packages/goal/goal/tests/goal.spec.ts

@@ -47,6 +47,7 @@ function stubAgentForSession(session: Session): StubAgent {
     inbox: new Inbox(session),
     ctx: new Context(),
     get status() { return status },
+    send: () => {},
     followup: () => {},
     steer: () => {},
     inject(input) {

packages/goal/goal/tests/projection.spec.ts

@@ -38,6 +38,7 @@ function liveAgent(ctx: Context, session: Session): Agent {
     inbox: new Inbox(session),
     ctx,
     get status() { return status },
+    send: () => {},
     followup: () => {},
     steer: () => {},
     inject(input: UserMessage) {

packages/goal/tool-goal/tests/tool-goal.spec.ts

@@ -32,6 +32,7 @@ function stubAgent(rawId: string, supplied?: Session): StubAgent {
     inbox: new Inbox(session),
     get status() { return status },
     ctx: new Context(),
+    send: () => {},
     followup: () => {},
     steer: () => {},
     inject(input) {