feat: inject post-compaction workspace context as system event (#18023)

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

@@ -19,6 +19,7 @@ import {
   updateSessionStoreEntry,
 } from "../../config/sessions.js";
 import { emitDiagnosticEvent, isDiagnosticsEnabled } from "../../infra/diagnostic-events.js";
+import { enqueueSystemEvent } from "../../infra/system-events.js";
 import { defaultRuntime } from "../../runtime.js";
 import { estimateUsageCost, resolveModelCostConfig } from "../../utils/usage-format.js";
 import { resolveResponseUsageMode, type VerboseLevel } from "../thinking.js";
@@ -36,6 +37,7 @@ import { appendUsageLine, formatResponseUsageLine } from "./agent-runner-utils.j
 import { createAudioAsVoiceBuffer, createBlockReplyPipeline } from "./block-reply-pipeline.js";
 import { resolveBlockStreamingCoalescing } from "./block-streaming.js";
 import { createFollowupRunner } from "./followup-runner.js";
+import { readPostCompactionContext } from "./post-compaction-context.js";
 import { enqueueFollowupRun, type FollowupRun, type QueueSettings } from "./queue.js";
 import { createReplyToModeFilterForChannel, resolveReplyToMode } from "./reply-threading.js";
 import { incrementRunCompactionCount, persistRunSessionUsage } from "./session-run-accounting.js";
@@ -547,6 +549,21 @@ export async function runReplyAgent(params: {
         lastCallUsage: runResult.meta.agentMeta?.lastCallUsage,
         contextTokensUsed,
       });
+
+      // Inject post-compaction workspace context for the next agent turn
+      if (sessionKey) {
+        const workspaceDir = process.cwd();
+        readPostCompactionContext(workspaceDir)
+          .then((contextContent) => {
+            if (contextContent) {
+              enqueueSystemEvent(contextContent, { sessionKey });
+            }
+          })
+          .catch(() => {
+            // Silent failure — post-compaction context is best-effort
+          });
+      }
+
       if (verboseEnabled) {
         const suffix = typeof count === "number" ? ` (count ${count})` : "";
         finalPayloads = [{ text: `🧹 Auto-compaction complete${suffix}.` }, ...finalPayloads];