fix: exclude e2e tests from unit test run (#241)

Unit test job was discovering e2e/*.e2e.test.ts files and reporting
them as skipped, causing misleading "6 skipped" in PR checks.

Now test:run excludes e2e/ directory. E2E tests run separately via
test:e2e with secrets in CI.

Written by Cameron ◯ Letta Code

"Clean signals lead to confident decisions." -- unknown

package.json

@@ -19,7 +19,7 @@
     "prepublishOnly": "npm run build && npm run test:run",
     "start": "node dist/main.js",
     "test": "vitest",
-    "test:run": "vitest run",
+    "test:run": "vitest run --exclude 'e2e/**'",
     "test:e2e": "vitest run e2e/",
     "skills": "tsx src/cli.ts skills",
     "skills:list": "tsx src/cli.ts skills list",