chore: merge main into release/1.3.0 for v1.3.0 merge-back
Override stale main-only docs (README/translations/CHANGELOG #540/#542/#546/#548) with the cleaned-up release content from next — these were old data confusing users and were intentionally removed on next. Strategy 'ours' keeps the release tree verbatim and records main as a parent so the merge-back is conflict-free. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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