catpaw and kiro tests leave their globalThis.fetch in place for later files in the root bun test #877

bun test at the repo root runs every file in one process, and two packages' tests replace globalThis.fetch without putting it back, so later files call through their wrappers.

• packages/catpaw/index.test.mjs:37 sets globalThis.fetch = (input, init) => realFetch(patched, init) in beforeAll and never restores it (the afterAll at :45 stops the fake server only). patched is a URL string, so a Request's method and headers are dropped: a fetch(new Request(url, {method: "POST"}), {body}) made by a later file goes out as a GET with a body and throws fetch() request with GET/HEAD method cannot have body.
• packages/kiro/usage.test.mjs:20 and builderid.test.mjs:22 set globalThis.fetch = offline at module load, so a file that runs after them in the same process gets the offline stub.

Seen on mote (macOS, Bun 1.4.2) while reviewing #847: bun test packages/catpaw packages/inkstone/api.test.mjs fails inkstone's "the fetch wiring is the request path" at #847's head, and bun test packages/kiro packages/inkstone/api.test.mjs fails the same test on main f379bf9 (14 fails, 1.3ms). Each passes alone.

Fix: save and restore globalThis.fetch in afterAll in both packages, and have catpaw's wrapper keep a Request's method, headers and body when it rewrites the URL.