I know that a minimal API is 4 jars, I remember facelets*.jar. What are the minimal JSF jars needed to deploy a JSF app with Tomcat?
Just use the JAR files which are provided/required by the JSF implementation you choose to use. Just download the implementation and read their own installation/users guide if you don't actually need more JAR files (as dependencies).
As of now there are only two major JSF implementations: Mojarra and MyFaces. The number of JAR files may vary per implementation and even version. Ultimately you need to make sure that you have both the JSF API and JSF implementation (which may exist of 2 or even 1 JAR file, depending on impl/version). MyFaces requires more commons-*.jar dependencies while Mojarra doesn't require any additional dependencies.
Since JSF 2.0, Facelets is bundled with the JSF implementation and has replaced JSP as default view technology.