test(org-seats): use real Goa enum values in org-seat tests

Address PR #122 review (Copilot + jordane): the org-seat tests used values
outside the Goa design enums, which the generated client validators reject and
which misrepresent the contract. Per jordane, fix the test data rather than
widening the enums:

- Role.Name "Member" → "Lead" ("Member" is not a real committee role; the
  non-editable seat's role is not asserted, so any valid role works).
- AppointedBy "Foundation Election" → "Community" (two sites): a valid,
  clearly non-entitlement appointed_by value, preserving the non-editable /
  forbidden-reassign test intent.

No enum/production changes. gofmt/build/vet/test -race/golangci-lint all green.

Signed-off-by: Luis Mori Guerra <luismorith@gmail.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

Author: luismoriguerra

cmd/committee-api/service/committee_org_seats_test.go

@@ -112,8 +112,8 @@ func TestGetOrgCommitteeSeats(t *testing.T) {
 		FirstName:         "Bob",
 		LastName:          "Kim",
 		Email:             "bob@example.com",
-		Role:              model.CommitteeMemberRole{Name: "Member"},
-		AppointedBy:       "Foundation Election",
+		Role:              model.CommitteeMemberRole{Name: "Lead"},
+		AppointedBy:       "Community",
 		Organization:      model.CommitteeMemberOrganization{ID: testOrgSFID},
 	}}
 
@@ -380,7 +380,7 @@ func TestReassignOrgCommitteeSeat(t *testing.T) {
 
 	t.Run("non-entitlement seat returns forbidden and never mutates", func(t *testing.T) {
 		seat := entitlementSeat()
-		seat.AppointedBy = "Foundation Election"
+		seat.AppointedBy = "Community"
 		writer := &mockCommitteeWriterOrchestrator{}
 		reader := &reassignReaderStub{stubCommitteeReader: &stubCommitteeReader{}, member: seat, rev: 1}
 		svc := &committeeServicesrvc{committeeWriterOrchestrator: writer, committeeReaderOrchestrator: reader}