fix(priority-queue): remove() should match items by value, not by priority

[renanmpimentel]

Problem

PriorityQueue.remove(item) passes customFindingComparator straight to Heap.remove. When it is omitted, Heap.remove falls back to this.compare, which in PriorityQueue compares priorities. So removing one item removes every item that shares its priority:

const pq = new PriorityQueue();
pq.add('a', 1);
pq.add('b', 1);
pq.add('c', 2);
pq.remove('a');
pq.toString();      // 'c'  -> 'b' was removed too
pq.hasValue('b');   // false

Fix

Default the finding comparator of remove() to value comparison (this.compareValue), the same comparator changePriority() already passes explicitly. Callers that pass a custom comparator are unaffected.

Tests

• New test should remove only the given item and keep items with the same priority: fails on master (hasValue(5) is false), passes with the fix.
• npm test: 178 suites / 588 tests pass; npm run lint clean.

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Found with supertest: mutation testing plus statement-removal analysis, with every finding confirmed by running the regression against the unmodified test.