fix(design): keep iterate sessions in the OS temp dir and normalize tripwire paths on Windows

design/src/session.ts

@@ -1,9 +1,10 @@
 /**
  * Session state management for multi-turn design iteration.
- * Session files are JSON in /tmp, keyed by PID + timestamp.
+ * Session files are JSON in the OS temp directory, keyed by PID + timestamp.
  */
 
 import fs from "fs";
+import os from "os";
 import path from "path";
 
 export interface DesignSession {
@@ -27,7 +28,7 @@ export function createSessionId(): string {
  * Get the file path for a session.
  */
 export function sessionPath(sessionId: string): string {
-  return path.join("/tmp", `design-session-${sessionId}.json`);
+  return path.join(os.tmpdir(), `design-session-${sessionId}.json`);
 }
 
 /**

design/test/models.test.ts

@@ -167,7 +167,7 @@ describe("image-generation call sites (Responses API)", () => {
 
   test("iterate: threaded and fresh fallback", async () => {
     const id = `models-test-${process.pid}-${Date.now()}`;
-    const session = path.join("/tmp", `design-session-${id}.json`);
+    const session = path.join(os.tmpdir(), `design-session-${id}.json`);
     const write = () => fs.writeFileSync(session, JSON.stringify({ id, lastResponseId: "resp_prev", originalBrief: "b", feedbackHistory: [], outputPaths: [], createdAt: "", updatedAt: "" }));
     try {
       write();

test/design-printed-paths.test.ts

@@ -25,14 +25,14 @@ function flowFiles(): string[] {
   const out: string[] = [];
   for (const entry of fs.readdirSync(ROOT, { withFileTypes: true })) {
     if (!entry.isDirectory() || entry.name.startsWith('.') || entry.name === 'node_modules') continue;
-    const skill = path.join(entry.name, 'SKILL.md');
+    const skill = `${entry.name}/SKILL.md`;
     if (fs.existsSync(path.join(ROOT, skill))) out.push(skill);
-    const sections = path.join(entry.name, 'sections');
+    const sections = `${entry.name}/sections`;
     if (fs.existsSync(path.join(ROOT, sections))) {
-      for (const f of fs.readdirSync(path.join(ROOT, sections))) if (f.endsWith('.md')) out.push(path.join(sections, f));
+      for (const f of fs.readdirSync(path.join(ROOT, sections))) if (f.endsWith('.md')) out.push(`${sections}/${f}`);
     }
   }
-  for (const f of fs.readdirSync(path.join(ROOT, 'scripts/resolvers'))) if (f.endsWith('.ts')) out.push(path.join('scripts/resolvers', f));
+  for (const f of fs.readdirSync(path.join(ROOT, 'scripts/resolvers'))) if (f.endsWith('.ts')) out.push(`scripts/resolvers/${f}`);
   return out;
 }