Sprint goal: close Phase 3 Atlas (unified nav chain, brand corps,
content refinement) and establish Phase 4 foundations (bookmark system,
location-culture resolution, character creation skeleton).
15 tickets assigned across server (7), client (5), copy (3).
Briefings written for all four teams. DB backup updated.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>