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Conor Luddy
d282744dbd
Closes #79. The divide-by-zero guard in diff_sessions() used a bare `continue`, silently dropping clusters whose A-side max_duration_ms was 0. A real regression where a previously-silent cluster started hanging (0 → N ms) was lost from the diff entirely. Replace with explicit 4-way branching: - both zero → stable - A=0, B>0 → drift, delta_pct = +inf (treated as worsened) - A>0, B=0 → drift, delta_pct = -100.0 (fully improved) - both nonzero → existing percentage logic, unchanged format_diff() renders the inf delta as `new` instead of `+inf%` for readability. Tests: 5 new in tests/test_diff.py covering each branch + a regression guard that the standard nonzero path still uses the drift threshold, plus format_diff render assertion for the inf case. Verification: ruff/black clean; 93 passed (88 → 93).