chore: M5 CI/Workflow Sweep - add blockers and contractile.just

Author: hyperpolymath

Justfile

@@ -7,6 +7,8 @@
 set shell := ["bash", "-euo", "pipefail", "-c"]
 
 # Default recipe: show help
+import? "contractile.just"
+
 default:
     @just --list