Initial commit: POE2 automated trade bot

Monitors pathofexile.com/trade2 for new listings, travels to seller
hideouts, buys items from public stash tabs, and stores them.

Includes persistent C# OCR daemon for fast screen capture + Windows
native OCR, web dashboard for managing trade links and settings,
and full game automation via Win32 SendInput.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/util/retry.ts

@@ -0,0 +1,24 @@
+import { sleep } from './sleep.js';
+import { logger } from './logger.js';
+
+export async function retry<T>(
+  fn: () => Promise<T>,
+  options: { maxAttempts?: number; delayMs?: number; label?: string } = {},
+): Promise<T> {
+  const { maxAttempts = 3, delayMs = 1000, label = 'operation' } = options;
+
+  for (let attempt = 1; attempt <= maxAttempts; attempt++) {
+    try {
+      return await fn();
+    } catch (err) {
+      if (attempt === maxAttempts) {
+        logger.error({ err, attempt, label }, `${label} failed after ${maxAttempts} attempts`);
+        throw err;
+      }
+      logger.warn({ err, attempt, label }, `${label} failed, retrying in ${delayMs}ms...`);
+      await sleep(delayMs * attempt);
+    }
+  }
+
+  throw new Error('Unreachable');
+}