gogobee now splits the realm's first-ever clear (zone_first, priority)
from a later repeat (zone_clear, bulletin) so a repeat is never filed as
a first-ever. Handle both:
- renderAdventure: zone_first keeps the "cleared for the very first
time" headline; zone_clear gets the personal "{subject} clears {zone}"
headline, sharing the lede. A tier fallback still handles a legacy
zone_first that predates the split.
- advEventMeta: zone_clear -> "Zone cleared" (distinct from zone_first's
"First clear"), so a repeat's permalink page and emblem aren't stamped
"First clear".
The GUID contract is otherwise unchanged: prefix == event_type, so the
permalink label derives correctly. Test: TestRenderZoneTaxonomy.
Deploy this before the matching gogobee change — a zone_clear fact hits
an un-updated Pete as an unknown event_type (400).
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