Add AGENTS.md

Author: davidkpiano

AGENTS.md

@@ -0,0 +1,13 @@
+This is a monorepo containing XState, @xstate/store, and related packages.
+
+## Dev environment
+
+- Use pnpm to install dependencies
+
+## PR instructions
+
+- Run `pnpm test` to run the tests in all packages, only for changes that affect mulitple packages.
+- Run `pnpm test:core` to only run core XState tests.
+- Run `pnpm test:store` to only run @xstate/store tests.
+- Run `pnpm typecheck` to make sure that there are no type errors.
+- Before making a PR, run `pnpm changeset` to create a changeset with a short description of the changes, and a code example if applicable. Do not include implementation details; only pertinent details for developers using the package.

CLAUDE.md

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

package.json

@@ -68,7 +68,7 @@
     "happy-dom": "^17.4.4",
     "husky": "^3.1.0",
     "knip": "^5.27.0",
-    "lint-staged": "^8.2.1",
+    "lint-staged": "^16.2.7",
     "prettier": "^3.1.0",
     "prettier-plugin-jsdoc": "^1.3.0",
     "synckit": "^0.8.5",
@@ -82,7 +82,7 @@
     }
   },
   "lint-staged": {
-    "*.{ts,tsx,js,jsx,json,md,mdx}": [
+    "!(CLAUDE).{ts,tsx,js,jsx,json,md,mdx}": [
       "prettier --write",
       "git add"
     ]