chore: move plugins/ to separate repo, gitignore the directory

plugins/ is now tracked at bvandeusen/fabledscryer-plugins.
Removed tracked traefik files from this repo's index (files remain on disk).
Added plugins/ to .gitignore so the directory is ignored going forward.

PLUGIN_DIR in config.yaml still points to plugins/ for local dev and Docker.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -1,6 +1,10 @@
 # Planning files
 docs/superpowers/
 
+# Plugin directory — managed as a separate repo (bvandeusen/fabledscryer-plugins)
+# PLUGIN_DIR in config.yaml points here at runtime
+plugins/
+
 # Python
 __pycache__/
 *.py[cod]