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48b7f61da3
Implemented the clear-gap comparison, with the log-distance-equivalent
algebra and pessimistic SM-clock fallback.
What changed:
- Added TimingInterval and interval construction from summaries:
- robust interval: [min, q3], centered at median
- fallback interval: clipped [mean - stdev, mean + stdev] intersected with [min, max]
- Added CLEAR_GAP_RELATIVE_THRESHOLD = 0.005.
- FAST gap uses:
(ref.lower - cmp.upper) / cmp.upper >= delta
which is equivalent to log(ref.lower / cmp.upper) >= log(1 + delta).
- SLOW gap uses:
(cmp.lower - ref.upper) / ref.upper >= delta
- FAST/SLOW now requires SM clock summaries on both sides and the same clear-gap result after scaling intervals by sm_clock_rate_mean.
- If intervals are missing, overlap, fail the gap threshold, have missing/invalid clock summaries, or time/cycle comparison disagrees, status is UNDECIDED.
- Existing center/noise values are still computed and displayed, but no longer drive FAST/SLOW/SAME classification.
Updated tests to cover:
- center/noise-only comparisons becoming UNDECIDED
- clear FAST/SLOW with matching clock evidence
- missing clock fallback to UNDECIDED
- frequency-shift disagreement becoming UNDECIDED
- regression reporting with robust interval and clock evidence