Same as latest, but running on Ruby head.

Assisted-by: Claude Opus 5.5 via Claude Code

diff --git a/host_vars/lotus-land-story.yml b/host_vars/lotus-land-story.yml
index 48859bd..4fae940 100644
--- a/host_vars/lotus-land-story.yml
+++ b/host_vars/lotus-land-story.yml
@@ -17,7 +17,7 @@ versions:
   monica:           4.1.2
   monica_mysql:     "5.7"
   paperless_ngx:    3.2.1
-  pro_tacts:        latest # TODO Pin the version once we're not in active development anymore
+  pro_tacts:        ruby-head-zjit # TODO Pin the version once we're not in active development anymore
   quire:            latest # TODO Pin the version once we're not in active development anymore
   soju:             0.11.1 # remember to update the docker-soju image to bump this
   vector:           0.59.0