fix: Align silent reply prompt guidance (#70954)

* Align silent reply prompt guidance

* Pass explicit silent reply conversation types

* Handle dm alias in direct prompt guidance

* Respect policy session type for routed replies

* Preserve routed silent reply policy type

* Propagate silent reply dispatcher chat type

* Align prompt silent reply target policy

* Avoid direct silent fallback prompt token

* Use inbound key for prompt silent policy

* Rewrite direct silent replies in dispatcher

test/helpers/agents/prompt-composition-scenarios.ts

@@ -10,7 +10,11 @@ import { resolveBootstrapContextForRun } from "../../../src/agents/bootstrap-fil
 import { buildEmbeddedSystemPrompt } from "../../../src/agents/pi-embedded-runner/system-prompt.js";
 import { buildAgentSystemPrompt } from "../../../src/agents/system-prompt.js";
 import { createStubTool } from "../../../src/agents/test-helpers/pi-tool-stubs.js";
-import { buildGroupChatContext, buildGroupIntro } from "../../../src/auto-reply/reply/groups.js";
+import {
+  buildDirectChatContext,
+  buildGroupChatContext,
+  buildGroupIntro,
+} from "../../../src/auto-reply/reply/groups.js";
 import {
   buildInboundMetaSystemPrompt,
   buildInboundUserContextPrefix,
@@ -118,6 +122,14 @@ function buildAutoReplySystemPrompt(params: {
 }) {
   const extraSystemPromptParts = [
     buildInboundMetaSystemPrompt(params.sessionCtx),
+    params.sessionCtx.ChatType === "direct" || params.sessionCtx.ChatType === "dm"
+      ? buildDirectChatContext({
+          sessionCtx: params.sessionCtx,
+          silentToken: SILENT_REPLY_TOKEN,
+          silentReplyPolicy: "disallow",
+          silentReplyRewrite: true,
+        })
+      : "",
     params.includeGroupChatContext ? buildGroupChatContext({ sessionCtx: params.sessionCtx }) : "",
     params.includeGroupIntro
       ? buildGroupIntro({
@@ -179,7 +191,7 @@ function createDirectScenario(workspaceDir: string): PromptScenario {
     OriginatingChannel: "slack",
     OriginatingTo: "D123",
     AccountId: "A1",
-    ChatType: "direct",
+    ChatType: "dm",
     SenderId: "U1",
     SenderName: "Alice",
     Body: "hi",