A curated event with letters in its own band now becomes the contained card header
(glyph, title, date, provenance, edit pencil) instead of a separate floating pill —
the title reads once. Derived life-events, world-bands, and letterless event pills
are unchanged (REQ-001 amended for curated-with-letters; the identity fixture now
links its letter to the curated event so the letterless world band stays a band).
Refs #827
Add the REQ-001 structural-identity check (the event pills/world-bands render
identically across all three grouping modes — the no-VRT-harness equivalent of
the pixel-diff) and the REQ-009 grep gate (no lib/timeline component reaches for
the raw-HTML directive). Reword the BucketHeaderChip doc to describe the
directive by name so the gate stays literal.
Refs #827
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
