chore(repo): Introduce basic AGENTS.md file (#8566)

Author: brkalow

.changeset/orange-dragons-join.md

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+---
+---

.prettierignore

@@ -23,3 +23,4 @@ packages/clerk-js/src/core/resources/index.ts
 packages/shared/src/compiled
 /**/CHANGELOG.md
 renovate.json5
+CLAUDE.md

AGENTS.md

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+# AGENTS.md
+
+Clerk's JavaScript SDK and library monorepo.
+
+## Guidelines
+
+- Non-major releases in `packages/clerk-js` and `packages/ui` are pushed out to consuming applications without requiring explicit package updates. Extra care must be put into any changes to these packages.
+- The API exposed from the core Clerk class in `packages/clerk-js/src/core/clerk.ts` is a contract that is depended on by internal and external consumers. Changes to this API must be done in a major version to avoid breakage.

CLAUDE.md

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+@AGENTS.md