Find the flaky tests an agent may quarantine

People have stopped reading red builds: they rerun them and hope. An agent hunts for flaky tests, ones that pass and fail on the same code, and proposes them for quarantine: out of the blocking suite until fixed.

Write find_quarantine_candidates(run_records): the rule your agent follows to pick the tests it proposes.

• run_records (list of str): one CI result per entry, written test,commit,result, for example "login_flow,c1,pass".
• Return the names of the tests to propose, each once, sorted in ascending order.

Rules:

1. Split each record on ,. A record that does not split into exactly 3 fields is skipped, so an empty string is skipped too. Fields are used exactly as written, with no trimming.
2. Only the exact result "pass" is a pass. Any other result ("fail", "error", "PASS", anything else) is a failure.
3. A test is a candidate only if, at one single commit, it has at least one pass and at least one failure. A pass at one commit and a failure at another does not count: that may be a new bug, not a flake.