docs(reviewer): anonymise reviewer references; profile-based framing

Replaces the "Springborn / Bobenko alumnus" placeholder in the reviewer
materials (briefing, questions, agenda, README) and in
locked-vs-flexible.md with a research-profile description:

  active researcher in the decorated-DCE / Penner-coordinates /
  canonical-tessellations / hyperideal-polyhedra line, treated as a
  peer most likely to USE conformallab++ as numerical infrastructure
  for their own future experiments — not merely to evaluate it.

Citations to the published literature (Springborn 2020 paper, etc.)
remain untouched.  Only personal references to the prospective
reviewer were anonymised.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

doc/reviewer/agenda.md

@@ -13,8 +13,10 @@ productive).
 ## Opening — 5 min
 
 - **Thank-you** + ~30 s on why I value their time specifically
-  (Springborn/Bobenko background = best-positioned audience for
-  this material).
+  (active researcher in the exact line — decorated DCE, Penner
+  coordinates, canonical tessellations, hyperideal polyhedra — that
+  conformallab++ aspires to be infrastructure for; best-positioned
+  audience for the material AND the most likely future power user).
 - **Confirm format**: they've read `briefing.md`? Yes → skip ahead.
   No → take 3 min to walk through it together via the reviewer-hub
   URL.