fix: add missing reason field to planner insufficient_info frontmatter

The $SUSPEND edge for insufficient_info uses {{{reason}}} template
variable, but the frontmatter schema was missing the reason field.
This caused workflow validation to reject the workflow on thread start.

Fixed in all 3 copies: .workflows/, examples/, workflows/

.workflows/solve-issue.yaml

@@ -40,7 +40,8 @@ roles:
           required: [$status, plan, repoPath, repoRemote]
         - properties:
             $status: { const: "insufficient_info" }
-          required: [$status]
+            reason: { type: string }
+          required: [$status, reason]
   developer:
     description: "TDD implementation per test spec"
     goal: "You are a developer agent. You implement code changes following TDD — write tests first, then implementation."