Add DiscardFlag.h and FilteringSpanProcessor references to the file
tree, key files table, and implementation summary in OpenTelemetryPlan.
Co-Authored-By: Claude Opus 4.6 <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>