Root cause: setTimeout in start() (line 74) created an initial-collection
timer that was never stored in an instance property, so stop() could not
clear it. Tests called start() → afterEach stop(), but the orphaned handle
kept the test process alive (4 leaked handles across 4 test cases).
Fix: store as this._initialTimeout, clear in stop() alongside digestTimeout.
Also replaced 3 remaining console.error calls in log-digest.js with
structured log.error tagged 'logdigest' (was missed in P1-8 sweep).
1539/1539 tests pass. 0 open handles (--detectOpenHandles clean).
Hermes
1bc41bb2bc