Add enum values to positional args and exclude --as-member from no-auth schemas

[AndreyVMarkelov]

Summary

• Propagates enum values to positional arguments (e.g. login token-type now reports personal, team-access, team-manage) in both the manifest args array and the generated input_schema
• Excludes --as-member from input_schema on commands that skip authentication (login, logout, completion, root), since the flag has no effect there
• Updates manifest schema to include enum_values as a required field on the arg definition

Test plan

• go test ./... passes
• golangci-lint run ./... clean
• gofmt -s -l . clean
• Tests verify login arg enum values in both args and input_schema
• Tests verify help, root, login, and completion exclude as_member from input_schema
• Tests verify verbose is retained (relevant global flag)
• Generated docs rebuilt and in sync