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/jacoby-powell.md

@@ -0,0 +1,48 @@
+---
+type: alumni-profile
+date: 2026-03-13
+updated: 2026-05-05
+discord: TBD
+role: alumni-mentor
+track: general
+nickname: "Jacoby Powell"
+emoji: "🐻"
+status:
+  mentorship: available
+  expertise: advanced
+---
+
+# Jacoby Powell — Alumni/Mentor
+
+## Who They Are
+- **Role:** Alumni / Mentor
+- **Nickname:** Jacoby Powell
+- **Emoji:** 🐻
+- **Team:** Former student, now trusted mentor
+
+## Nickname History (Team Default: Japookiebear 🐻)
+The following nicknames were all used at various times: Jacuzzi, Jakota, Jamonda, Jamanga, Jahoba, Jerardo, Jacodo, Jaminga, Jahova, Jacoba, Jaketa, Jacoova, Jramondo, Jacuzza, Jacooby, Jacobi, Jacouger, Jabooda, Jacooda, Jamany, Shacoby, Japotle, Jakourtney, Jacoobydoobydoo, Jamaji, Jakunamattata, Jaquavius, Jaqueef, Coobi, Jaquela, Jasomething, Jaquille O'Neal, Jacobby, Japookiebear (**TEAM DEFAULT**), unc
+
+## Training Progress
+
+| Track | Level | Status |
+|-------|-------|--------|
+| General | Advanced | Alumni mentor |
+
+## Notes
+- Trusted former student — can be looped in for advice/mentoring
+- Extensive FRC experience as a student
+- Available for questions about team history and culture
+
+## Expertise Areas
+- Competition experience
+- Team culture
+- Technical advice (former competitor)
+- Historical context
+
+## Related Training Hubs
+- Any hub — can provide alumni perspective
+
+---
+
+*Profile managed by MrC.*