Talent Network — cross-org athlete discovery

The Talent Network is a cross-org athlete discovery portal — opt-in by the athlete, searchable by any program.

How athletes opt in:
- /me/athlete → Talent profile → toggle "List me on the Talent Network"
- They write their bio, set position(s), upload film, add measurables
- The profile lives at `/athleteTalentProfiles/{uid}` (doc id = uid so `optIn` and `blockedOrgIds` can't be tampered by another org)

How programs search:
- Sports → Talent tab → filter by position, age band, region, measurables, current team
- Wally `sports_searchTalentNetwork` does the same from chat

Privacy guarantees:
- Athlete can block specific orgs from seeing the profile
- Athlete can pull the listing at any time — instant; no caching
- Only opt-in profiles are visible

Recruiting actions:
- Programs can "Express interest" — this writes a note to the athlete's inbox (no contact info exposed without athlete consent)
- Athlete reviews and decides whether to share contact

For college / pro recruiting flows, the export integrations (NCSA, SportsRecruits, Baseball Savant, Synergy) push directly from the athlete's dossier — `sports_exportToRecruiting` packages the profile.