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Mock global.fetch in tests instead of calling the live USPS API

The tracking tests hit the live USPS sandbox (apis-tem.usps.com), which
intermittently returns 503 and had kept CI red for weeks. Replace fetch
with a node:test mock that routes the oauth and tracking endpoints to
canned responses — no live calls, no new dependencies.

Runs serially (global fetch mocking and concurrency don't mix) and
clears the memory-cache token singleton between tests. The invalid-URL
test still uses real fetch to assert its parse error.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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