fix(branching): route diamond-* task types to premium branch

Complex Diamond tasks (diamond-develop, diamond-discover, etc.) now
correctly route to the premium tentacle path when complexity is high.
Previously only coding|review|design task types were matched.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: nyldn

scripts/orchestrate.sh

@@ -303,7 +303,7 @@ evaluate_branch_condition() {
     case "$complexity" in
         3)  # Complex tasks → premium tentacle
             case "$task_type" in
-                coding|review|design) echo "premium" ;;
+                coding|review|design|diamond-*) echo "premium" ;;
                 *) echo "standard" ;;
             esac
             ;;