fix: stabilize flaky tests and sanitize directive-only chat tags

src/gateway/server-methods/chat.test-helpers.ts

@@ -0,0 +1,42 @@
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+import { CURRENT_SESSION_VERSION } from "@mariozechner/pi-coding-agent";
+
+export function createTranscriptFixtureSync(params: {
+  prefix: string;
+  sessionId: string;
+  fileName?: string;
+}) {
+  const dir = fs.mkdtempSync(path.join(os.tmpdir(), params.prefix));
+  const transcriptPath = path.join(dir, params.fileName ?? "sess.jsonl");
+  fs.writeFileSync(
+    transcriptPath,
+    `${JSON.stringify({
+      type: "session",
+      version: CURRENT_SESSION_VERSION,
+      id: params.sessionId,
+      timestamp: new Date(0).toISOString(),
+      cwd: "/tmp",
+    })}\n`,
+    "utf-8",
+  );
+  return { dir, transcriptPath };
+}
+
+export function createMockSessionEntry(params: {
+  transcriptPath: string;
+  sessionId: string;
+  canonicalKey?: string;
+  cfg?: Record<string, unknown>;
+}) {
+  return {
+    cfg: params.cfg ?? {},
+    storePath: path.join(path.dirname(params.transcriptPath), "sessions.json"),
+    entry: {
+      sessionId: params.sessionId,
+      sessionFile: params.transcriptPath,
+    },
+    canonicalKey: params.canonicalKey ?? "main",
+  };
+}