feat(msw): add @bupkis/msw package for MSW request verification (#346)

Provides natural language assertions for verifying HTTP requests
intercepted by [Mock Service Worker](https://npm.im/msw) (MSW):

- `TrackedServer` wrapping `SetupServerApi` with request tracking
- Path assertions: 'to have handled request to', 'to have handled request matching'
- Request options: `method`, `body`, `headers`, `times`, `once`
- Body matching uses 'to satisfy' semantics via `expectAsync`
- Implements `Disposable` for automatic cleanup with `using` syntax
- `waitForBodies()` helper for direct body access

Author: boneskull

AGENTS.md

@@ -18,6 +18,7 @@ This is an npm workspaces monorepo. All packages live in `packages/`:
 | `@bupkis/events`           | `packages/events`           | EventEmitter and EventTarget assertions       |
 | `@bupkis/from-chai`        | `packages/from-chai`        | Codemod to migrate Chai assertions            |
 | `@bupkis/from-jest`        | `packages/from-jest`        | Codemod to migrate Jest/Vitest assertions     |
+| `@bupkis/msw`              | `packages/msw`              | MSW request verification assertions           |
 | `@bupkis/property-testing` | `packages/property-testing` | Property-based testing harness for assertions |
 | `@bupkis/rxjs`             | `packages/rxjs`             | RxJS Observable assertions                    |
 | `@bupkis/sinon`            | `packages/sinon`            | Sinon spy/stub/mock assertions                |
@@ -158,6 +159,16 @@ A codemod tool to migrate Jest and Vitest assertions to bupkis. Supports:
 - Negation (`.not` → `'not to ...'`)
 - Both CLI (`bupkis-from-jest`) and programmatic API
 
+### @bupkis/msw (`packages/msw`)
+
+MSW (Mock Service Worker) request verification assertions for bupkis. Provides:
+
+- `createTrackedServer()` - Wraps MSW's `setupServer` with request tracking
+- Path assertions (`to have handled request to`, `to have handled request matching`)
+- Request options (method, body, headers, times, once)
+- Body matching uses "to satisfy" semantics
+- Header matching supports exact strings or RegExp patterns
+
 ### @bupkis/property-testing (`packages/property-testing`)
 
 Property-based testing harness using fast-check. Provides utilities for systematically testing assertions across four variants: valid, invalid, validNegated, invalidNegated.
@@ -286,7 +297,7 @@ This project uses [Conventional Commits](https://www.conventionalcommits.org/) w
 
 **Commit Format:** `<type>(<scope>): <description>`
 
-- **Scopes** correspond to package names: `bupkis`, `events`, `from-chai`, `from-jest`, `http`, `property-testing`, `rxjs`, `sinon`
+- **Scopes** correspond to package names: `bupkis`, `events`, `from-chai`, `from-jest`, `http`, `msw`, `property-testing`, `rxjs`, `sinon`
 - **Types** follow a limited set of standard conventions: `feat`, `fix`, `chore`, `docs`
 
 **Cross-Package Changes Require Careful Consideration:**

README.md

@@ -10,7 +10,7 @@
 
 ---
 
-This is the monorepo for [**BUPKIS**](https://bupkis.zip), the uncommonly extensible assertion library.
+This is the monorepo for [**BUPKIS**][docs], the _uncommonly extensible assertion library._
 
 ## Packages
 
@@ -19,26 +19,34 @@ This is the monorepo for [**BUPKIS**](https://bupkis.zip), the uncommonly extens
 ### Plugins
 
 - **[@bupkis/events](./packages/events/)** - Event emitter assertions
-- **[@bupkis/rxjs](./packages/rxjs/)** - RxJS Observable assertions
-- **[@bupkis/sinon](./packages/sinon/)** - Sinon spy/stub/mock assertions
 - **[@bupkis/http](./packages/http/)** - HTTP response assertions
+- **[@bupkis/msw](./packages/msw/)** - [MSW][] request verification assertions
+- **[@bupkis/rxjs](./packages/rxjs/)** - [RxJS][] Observable assertions
+- **[@bupkis/sinon](./packages/sinon/)** - [Sinon.JS][] spy/stub/mock assertions
 
 ### Migration Tools
 
-- **[@bupkis/from-jest](./packages/from-jest/)** - Codemod to migrate Jest/Vitest assertions to bupkis
+- **[@bupkis/from-jest](./packages/from-jest/)** - Codemod to migrate Jest/Vitest assertions to **BUPKIS**
 
 ### Testing Tools
 
-- **[@bupkis/property-testing](./packages/property-testing/)** - Property-based testing harness for bupkis assertions
+- **[@bupkis/property-testing](./packages/property-testing/)** - Property-based testing harness for **BUPKIS** assertions
 
 ## Resources
 
-- [Official Documentation](https://bupkis.zip)
-- [npm](https://www.npmjs.com/package/bupkis)
-- [GitHub](https://github.com/boneskull/bupkis)
+- [Official Documentation][docs]
+- **BUPKIS** on [npm][]
+- **BUPKIS** on [GitHub][]
 
 ## License
 
-Copyright © 2025 [Christopher "boneskull" Hiller][boneskull]. Licensed under [BlueOak-1.0.0](https://blueoakcouncil.org/license/1.0.0).
+Copyright © 2025 [Christopher "boneskull" Hiller][boneskull]. Licensed under [BlueOak-1.0.0][].
 
 [boneskull]: https://github.com/boneskull
+[MSW]: https://mswjs.io
+[RxJS]: https://rxjs.dev
+[Sinon.JS]: https://sinonjs.org
+[docs]: https://bupkis.zip
+[npm]: https://www.npmjs.com/package/bupkis
+[GitHub]: https://github.com/boneskull/bupkis
+[BlueOak-1.0.0]: https://blueoakcouncil.org/license/1.0.0