chore: add cursor rules for bun runtime and changesets

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Zendrex

.cursor/mcp.json

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+{
+	"mcpServers": {}
+}

.cursor/rules/changesets.mdc

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+---
+alwaysApply: true
+---
+This project uses Changesets for versioning and releases.
+
+## When committing changes
+
+Before making a commit that affects the library's functionality, create a changeset:
+
+```bash
+bun changeset
+```
+
+Then select the appropriate version bump:
+- `patch` - Bug fixes, internal changes
+- `minor` - New features (backwards compatible)
+- `major` - Breaking changes
+
+Include the generated `.changeset/*.md` file in your commit.
+
+## When to include a changeset
+
+**Include a changeset for:**
+- Bug fixes
+- New features
+- Breaking changes
+- API changes
+- Behavior changes
+
+**Skip changesets for:**
+- Documentation-only changes
+- CI/tooling changes
+- Internal refactors with no user-facing impact
+- Test-only changes
+
+## Workflow
+
+1. Make code changes
+2. Run `bun changeset` and describe the change
+3. Commit both code changes and the changeset file together

.cursor/rules/runtime.mdc

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+---
+alwaysApply: true
+---
+Default to using Bun instead of Node.js.
+
+- Use `bun <file>` instead of `node <file>` or `ts-node <file>`
+- Use `bun test` instead of `jest` or `vitest`
+- Use `bun build <file.html|file.ts|file.css>` instead of `webpack` or `esbuild`
+- Use `bun install` instead of `npm install` or `yarn install` or `pnpm install`
+- Use `bun run <script>` instead of `npm run <script>` or `yarn run <script>` or `pnpm run <script>`
+- Use `bunx <package> <command>` instead of `npx <package> <command>`
+- Bun automatically loads .env, so don't use dotenv.
+
+## APIs
+
+- `Bun.redis` for Redis. Don't use `ioredis`.
+- `WebSocket` is built-in. Don't use `ws`.
+
+## Testing
+
+Use `bun test` to run tests.
+
+```ts#index.test.ts
+import { test, expect } from "bun:test";
+
+test("hello world", () => {
+  expect(1).toBe(1);
+});
+```
+
+For more information, read the Bun API docs in `node_modules/bun-types/docs/**.mdx`.

.cursor/worktrees.json

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+{
+	"setup-worktree": ["bun install"]
+}