Fix conformance.test.ts: correct packages path and relax publishConfig.bin check

- Fix ../../packages → ../packages (e2e/ and packages/ are siblings at repo root)
- Allow bin → .js directly without publishConfig.bin (connector packages already
  point bin to dist/bin.js, making publishConfig.bin redundant)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Committed-By-Agent: claude

Author: tonyxiao

e2e/conformance.test.ts

@@ -10,7 +10,7 @@ import {
   destinationTestSpec,
 } from '@stripe/sync-engine'
 
-const packagesDir = resolve(import.meta.dirname, '../../packages')
+const packagesDir = resolve(import.meta.dirname, '../packages')
 const packageDirs = readdirSync(packagesDir, { withFileTypes: true })
   .filter((d) => d.isDirectory())
   .map((d) => d.name)
@@ -166,15 +166,20 @@ describe.each(connectorDirs)('connector bin: %s', (dir) => {
     expect(typeof pkg.bin).toBe('object')
     const binPaths = Object.values(pkg.bin!)
     expect(binPaths.length).toBeGreaterThan(0)
-    // Dev bin points to .ts source; publishConfig.bin points to .js dist
-    for (const p of binPaths) {
-      expect(p).toMatch(/\.(js|ts)$/)
-    }
-    // publishConfig.bin must exist and point to .js
     const publishBin = pkg.publishConfig?.bin as Record<string, string> | undefined
-    expect(publishBin, 'publishConfig.bin should exist').toBeDefined()
-    for (const p of Object.values(publishBin!)) {
-      expect(p).toMatch(/\.js$/)
+    if (publishBin) {
+      // Two-field pattern: bin → .ts source, publishConfig.bin → .js dist
+      for (const p of binPaths) {
+        expect(p).toMatch(/\.(js|ts)$/)
+      }
+      for (const p of Object.values(publishBin)) {
+        expect(p).toMatch(/\.js$/)
+      }
+    } else {
+      // Single-field pattern: bin already points to .js dist
+      for (const p of binPaths) {
+        expect(p, `bin path "${p}" should point to a .js file`).toMatch(/\.js$/)
+      }
     }
   })