## Summary
- Adds a privilege check to workspace-level impersonation: non-admin
users can no longer impersonate users who have `canAccessFullAdminPanel`
or `canImpersonate` flags
- Adds the same check in JWT token validation as defense-in-depth
(invalidates existing impersonation sessions targeting admin users)
- Adds 3 unit tests covering: non-admin → admin blocked, non-admin →
canImpersonate blocked, admin → admin allowed
## Test plan
- [x] Unit tests pass (14/14 in `impersonation.service.spec.ts`)
- [x] Typecheck passes
- [ ] Verify workspace-level impersonation of regular users still works
normally
- [ ] Verify server-level impersonation by admins is unaffected
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
