fix: use run-bun.mjs wrapper for prepare hook compatibility

During npm install's prepare hook, node_modules/.bin is not in PATH,
so calling 'bun' directly fails. The new run-bun.mjs wrapper finds
bun at node_modules/.bin/bun and runs it with the correct path.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: 2 people

package.json

@@ -34,7 +34,7 @@
   "scripts": {
     "postinstall": "node scripts/setup-bun.mjs || echo 'setup-bun.mjs failed or not available'",
     "generate:schemas": "tsx scripts/generate-schemas.ts && prettier --write \"src/generated/**/*\"",
-    "build": "npm run generate:schemas && bun build.bun.ts",
+    "build": "npm run generate:schemas && node scripts/run-bun.mjs build.bun.ts",
     "prepack": "npm run build",
     "build:all": "npm run build && npm run examples:build",
     "test": "bun test src",

scripts/run-bun.mjs

@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+/**
+ * Wrapper script to run bun with the correct path.
+ * This is needed because during npm install's prepare hook,
+ * node_modules/.bin is not in PATH yet.
+ */
+import { spawn } from "child_process";
+import { existsSync } from "fs";
+import { join, dirname } from "path";
+import { fileURLToPath } from "url";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const projectRoot = join(__dirname, "..");
+const isWindows = process.platform === "win32";
+const bunExe = isWindows ? "bun.exe" : "bun";
+
+// Find bun binary
+const bunPaths = [
+  join(projectRoot, "node_modules", ".bin", bunExe),
+  // Fallback to system bun
+  "bun",
+];
+
+let bunPath = null;
+for (const p of bunPaths) {
+  if (p === "bun" || existsSync(p)) {
+    bunPath = p;
+    break;
+  }
+}
+
+if (!bunPath) {
+  console.error("Could not find bun binary");
+  process.exit(1);
+}
+
+// Run bun with the provided arguments
+const args = process.argv.slice(2);
+const child = spawn(bunPath, args, {
+  stdio: "inherit",
+  shell: isWindows,
+});
+
+child.on("exit", (code) => {
+  process.exit(code ?? 0);
+});
+
+child.on("error", (err) => {
+  console.error("Failed to run bun:", err.message);
+  process.exit(1);
+});