SpanTrace Timeline Audit

Turn Chrome Trace Event JSON into a focused local timeline audit. SpanTrace parses complete X events and paired B/E events, normalizes microsecond timestamps, and compares span names, categories, start times, durations, process IDs, and thread IDs. Read a positioned timeline, rank complete spans at or above 50 ms, review same-thread overlaps and idle gaps, and compare thread or category coverage. Export a designed PDF audit or complete CSV span ledger. Summed span duration reflects instrumentation coverage and is not CPU utilization. Signals do not prove a performance defect. No account, subscription, in-app purchase, ads, analytics, tracking, cloud sync, or developer-server upload.