Registration form drops the ledger input entirely -- Trust Service
auto-computes the canonical /phases/{id}/ledger reference at
registration time, no human types it in v0. Schema field itself is
unaffected (still present, still federation-ready). Drill-down shows
only the raw reference + a live-data link when it resolves to this
instance; the existing Ledger entries table on phase_detail.html is
untouched and stays exactly as prominent.
All four T02-T04 decisions now feed T05's spec addendum draft.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>