fix: preserve subagent thread routing (#1241)

Thanks @gnarco.

Co-authored-by: gnarco <gnarco@users.noreply.github.com>

src/auto-reply/reply/agent-runner-execution.ts

@@ -210,6 +210,8 @@ export async function runAgentTurnWithFallback(params: {
             sessionKey: params.sessionKey,
             messageProvider: params.sessionCtx.Provider?.trim().toLowerCase() || undefined,
             agentAccountId: params.sessionCtx.AccountId,
+            messageTo: params.sessionCtx.OriginatingTo ?? params.sessionCtx.To,
+            messageThreadId: params.sessionCtx.MessageThreadId ?? undefined,
             // Provider threading context for tool auto-injection
             ...buildThreadingToolContext({
               sessionCtx: params.sessionCtx,