Rebrand user-visible CLI text; add legacy fallbacks for keyring, cache dir and version prefix

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/cmd/base/dev.go

@@ -350,7 +350,7 @@ func (b *Server) createInitialLdapAuthMethod(ctx context.Context, host string, p
 		scope.Global.String(),
 		ldap.WithUrls(ctx, u),
 		ldap.WithName(ctx, "Generated global scope initial ldap auth method"),
-		ldap.WithDescription(ctx, "Provides initial administrative and unprivileged authentication into Boundary"),
+		ldap.WithDescription(ctx, "Provides initial administrative and unprivileged authentication into Threshold"),
 		ldap.WithDiscoverDn(ctx),
 		ldap.WithUserDn(ctx, testdirectory.DefaultUserDN),
 		ldap.WithGroupDn(ctx, testdirectory.DefaultGroupDN),
@@ -602,7 +602,7 @@ func (b *Server) createInitialOidcAuthMethod(ctx context.Context) (*oidc.AuthMet
 		b.DevOidcSetup.clientId,
 		b.DevOidcSetup.clientSecret,
 		oidc.WithName("Generated global scope initial oidc auth method"),
-		oidc.WithDescription("Provides initial administrative and unprivileged authentication into Boundary"),
+		oidc.WithDescription("Provides initial administrative and unprivileged authentication into Threshold"),
 		oidc.WithIssuer(discoveryUrl),
 		oidc.WithApiUrl(b.DevOidcSetup.callbackUrl),
 		oidc.WithSigningAlgs(oidc.EdDSA),