runtime: split ipc queue and runner helpers

runners/agent-runner/src/ipc-input.ts

@@ -0,0 +1,52 @@
+import fs from 'fs';
+import path from 'path';
+
+export function shouldClose(closeSentinelPath: string): boolean {
+  if (fs.existsSync(closeSentinelPath)) {
+    try {
+      fs.unlinkSync(closeSentinelPath);
+    } catch {
+      // Ignore cleanup errors on shutdown signal files.
+    }
+    return true;
+  }
+  return false;
+}
+
+export function drainIpcInput(
+  inputDir: string,
+  log: (message: string) => void,
+): string[] {
+  try {
+    fs.mkdirSync(inputDir, { recursive: true });
+    const files = fs
+      .readdirSync(inputDir)
+      .filter((file) => file.endsWith('.json'))
+      .sort();
+
+    const messages: string[] = [];
+    for (const file of files) {
+      const filePath = path.join(inputDir, file);
+      try {
+        const data = JSON.parse(fs.readFileSync(filePath, 'utf-8'));
+        fs.unlinkSync(filePath);
+        if (data.type === 'message' && data.text) {
+          messages.push(data.text);
+        }
+      } catch (err) {
+        log(
+          `Failed to process input file ${file}: ${err instanceof Error ? err.message : String(err)}`,
+        );
+        try {
+          fs.unlinkSync(filePath);
+        } catch {
+          // Ignore best-effort cleanup failures.
+        }
+      }
+    }
+    return messages;
+  } catch (err) {
+    log(`IPC drain error: ${err instanceof Error ? err.message : String(err)}`);
+    return [];
+  }
+}