docs(changelog): expand v1.0.0 entry with full fix sweep
The original v1.0.0 changelog only documented the rebrand. After the CodeRabbit pass added 9 follow-up fix commits (3 critical bugs plus 21 major findings, grouped into safety / crash-class / correctness / threading / resource / performance categories), the changelog needs to reflect what users are actually receiving. yaml + repo.json synchronized.
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