Models:
- ProjectTeamMember.Responsibility (new) + .Role (kept as deprecated shadow). JSON exposes both during the deprecation window.
- ProjectTeamMemberWithUser.UserProfession — populated by reads so the team-tab UI can render the firm-tier badge.
- User.Profession (*string) — structured firm-tier driving the approval ladder. Distinct from JobTitle (display) and GlobalRole (tool admin).
TeamService:
- AddMember signature kept as (callerID, projectID, userID, responsibility) — third arg renamed conceptually. Accepts the new responsibility enum and writes both legacy `role` (via legacyRoleFromResponsibility helper) and `responsibility` to keep the deprecated shadow consistent.
- ListDirectMembers + ListEffectiveMembers SELECT both `pt.role`, `pt.responsibility`, and `u.profession`. ORDER BY switches from pt.role to pt.responsibility.
- legacy isValidRole removed (unused after switch to IsValidResponsibility).
UserService:
- CreateUserInput + AdminCreateInput + AdminUpdateInput accept Profession. Self-service onboarding defaults to 'associate' when empty. AdminCreate likewise. AdminUpdate empty-string clears to NULL (external collaborator). Invalid values rejected with ErrInvalidInput.
- INSERT statements write the new column on both Create paths.
ProjectService.Create:
- Auto-add-creator INSERT writes responsibility='lead' alongside legacy role='lead'.
Handlers:
- POST /api/projects/{id}/team accepts `responsibility` (preferred) and falls back to legacy `role` for one release while frontend migrates.
Build + vet clean. Pure-Go tests pass.
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