Improve hotspot attribution diagnostics#83
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…s, harden cpu pattern attribution via source validation, recalibrate deopt-loop thresholds
When the V8 heap sampler runs without observing any allocation, the memory profile silently looked healthy (confidence: high, no reasons). Add an explicit quality reason + recommendation so consumers can tell "capture vide" from a real signal — typical with idle workloads, overly-short --duration, or scripts that only allocate off-heap (Buffer.alloc, ArrayBuffer, native modules). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
Validation