feat(assets): Add real terminal GIF hero

Use the real Windows Terminal capture for the README hero and add the generated GIF asset for Tiny Tool Town and GitHub.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: ericchansen

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-  <img src="assets/hero-animated.svg" alt="PSCommandHelper — type rm -rf ./build, get Remove-Item -Recurse -Force" width="900">
+  <img src="assets/hero-animated.gif" alt="PSCommandHelper — type rm -rf ./build, get Remove-Item -Recurse -Force" width="900">
 </p>
 
 # PSCommandHelper