The pin lifetime tests slept for 15 ms and assumed a 30 ms timer had not expired. A busy CI runner can resume late and fail these tests even when pin behavior is correct.

Use a synchronous clock in these two tests. Verify a renewed pin survives the original deadline and expires exactly at its new deadline; restore timer mocks after each test. Production code is unchanged.

Validation: 20 repeated test-file runs, all 458 editor tests, editor type checks, and repository formatting pass. Removing cancellation or expiry makes the tests fail as expected.