Add full Team 2890 roster — all 18 members with profiles

Students:
- fox.md (electrician)
- big-papa.md (student coach)
- jacob-firebreaker019.md (driver, 2026)
- jacob-m-jawarrior.md (programmer)
- ryan.md (operator)
- riley.md (technician) — updated with full profile
- steven.md (human player)
- alex-c.md (mentor, 21yr FRC vet)
- matthew.md (observer)
- kiera.md (team mascot)

Leadership/Mentors:
- gina-nakahara-clark.md (founding teacher)
- mr-douglas.md (programming mentor)
- walt.md (head mentor)
- chris-slater.md (lead coach)
- jackie.md (team mom)
- kp.md (rules guy)

Alumni:
- jacoby-powell.md (alumni/mentor)
- greyson-w.md (alumni/mentor, top coder)

Each profile includes: role, training track, status, emoji nickname, hub links

entities/index.md

@@ -2,5 +2,6 @@
 
 ## Generated
 <!-- openclaw:wiki:entities:index:start -->
-- No entities yet.
+- [Bruno — Student Profile](entities/bruno.md)
+- [Riley — Student Profile](entities/riley.md)
 <!-- openclaw:wiki:entities:index:end -->