Feat v0.2.8 team admin audit (#12)

Co-authored-by: Jeffrey Smith <jasafpro@gmail.com>
Co-committed-by: Jeffrey Smith <jasafpro@gmail.com>

CHANGELOG.md

@@ -2,6 +2,35 @@
 
 All notable changes to Switchboard Core are documented here.
 
+## v0.2.8 — Team Admin Settings Audit (Pass 1)
+
+### Removed
+
+- **Dead `HasPrivateProviderRequirement`**: Store method checked team settings
+  for `require_private_providers` (BYOK vestige). Removed from interface,
+  PostgreSQL, and SQLite implementations. No callers existed.
+- **Dead `UserRole` field on `TeamMember`**: Joined `users.role` column
+  (deprecated in v0.2.0 RBAC migration). Removed from model, `ListMembers`
+  and `GetMember` queries in both stores. Frontend never consumed it.
+- **Dead `allow_team_providers` policy**: Removed from `PolicyDefaults`, both
+  test seed data blocks, and ICD test assertions. No handler or UI read it.
+- **Dead personas in workflow stage UI**: Removed `sw.api.teams.personas()`
+  call (endpoint doesn't exist), personas state, persona dropdown in
+  StageForm, and persona badge in stage list.
+- **Dead `history_mode` in stage UI**: Removed history mode selector and state
+  from StageForm. Backend column retained for v0.3.x schema migration.
+- **Dead ICD tests**: Removed assertions for `/teams/:teamId/personas`,
+  `/teams/:teamId/providers`, and `/teams/:teamId/models` — endpoints were
+  removed in Phase 0 fork.
+- **Stale `chat_only` stage mode**: Frontend `STAGE_MODES` updated from
+  `['chat_only', 'form_only', 'form_chat', 'review']` to
+  `['form_only', 'form_chat', 'review', 'custom']` matching the backend
+  CHECK constraint.
+- **Stale comments**: Removed references to deleted `team_providers.go`,
+  `personas.go`, and `apiconfigs.go` files.
+
+---
+
 ## v0.2.7 — User Settings Audit
 
 ### Changed