Add trace_id = txHash[0:16] strategy so all nodes handling the same
transaction independently produce spans under the same trace_id,
combined with protobuf span_id propagation for parent-child ordering.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Run .github/scripts/rename/docs.sh to replace rippled → xrpld
references in all plan documentation files, fixing the check-rename
CI failure.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>