feat: add aria snapshot utilities

.gitignore

@@ -1,3 +1,6 @@
 node_modules
 dist
 *.tsbuildinfo
+__screenshots__
+.vitest-attachments
+vendor/

AGENTS.md

@@ -0,0 +1,20 @@
+## Playwright source reference
+
+When you need to reference Playwright source code (e.g. for ARIA snapshot implementation details), clone it locally:
+
+```sh
+git clone --depth 1 https://github.com/microsoft/playwright.git vendor/playwright
+```
+
+The `vendor/` directory is gitignored. For example, you can search for:
+
+- `packages/playwright-core/src/server/injected/ariaSnapshot.ts` — ARIA snapshot logic
+- `packages/playwright-core/src/server/injected/roleUtils.ts` — role/ARIA utilities
+
+## Tests
+
+- Iterate on aria snapshot utility feature
+
+```sh
+pnpm test test/aria.test.ts --browser.headless --update
+```

CLAUDE.md

@@ -0,0 +1 @@
+@AGENTS.md

package.json

@@ -25,6 +25,7 @@
   "main": "./dist/index.js",
   "exports": {
     ".": "./dist/index.js",
+    "./aria": "./dist/aria/index.js",
     "./utils": "./dist/publicUtils.js"
   },
   "scripts": {
@@ -41,7 +42,8 @@
     "tsdown": "^0.21.2",
     "typescript": "^5.8.2",
     "vite": "^8.0.0",
-    "vitest": "^4.1.0"
+    "vitest": "^4.1.0",
+    "yaml": "^2.8.2"
   },
   "packageManager": "pnpm@10.32.1+sha512.a706938f0e89ac1456b6563eab4edf1d1faf3368d1191fc5c59790e96dc918e4456ab2e67d613de1043d2e8c81f87303e6b40d4ffeca9df15ef1ad567348f2be"
 }