# Experiment 60B.69 — Post-Refactor Deterministic Closure Path Replay

**Date:** 2026-08-14
**Branch:** `feature/decision-sufficiency-module-v0.44`
**Experiment commit:** 1ca5026 experiment: confirm post-refactor live equivalence

## Objective

When the post-refactor production code receives the exact proposal shape where only the customer factor resolves and the parent decision remains unknown, does the extracted `decision-sufficiency.js` path close that existing decision exactly as the pre-refactor 60B.66 path did?

## Hypothesis

```
Customer factor: updated → resolved (in place)
Parent decision: NOT updated by proposal (remains unknown entering applyValidatedProposal)
Raw answer contains confirmation phrase: "There are no other material uncertainties between launching this year and waiting twelve months."

Expected post-mutation:
  customer status = resolved
  decision status = resolved (via deterministic closure, not via proposal mutation)
  decision value = null (no directional recommendation invented by closure)
  activeUnknownNodeId = null
  selectedQuestion = null
  resolvedUnknownNodeIds contains both customer and decision
  addedNodes = []
  addedEdges = []
```

## Critical distinction

This experiment is NOT asking whether the LLM produces a good closure proposal.

It asks: **when the deterministic closure path is actually required, does the post-refactor production path still behave exactly like the pre-refactor baseline?**

## Apparatus

The existing regression `60B.64 — explicit decision sufficiency closure > Test 1` already exercises the exact 60B.56-shaped proposal:

- **Proposal:** only `n_enterprise_customer_signing` updated to resolved; `n_product_launch_decision` NOT in `updatedNodes`
- **Raw answer:** "There are no other material uncertainties between launching this year and waiting twelve months." (confirmation phrase)
- **Parent decision enters as unknown** → must be resolved by deterministic closure

No new harness created. The existing regression is reused directly.

## Baseline comparison

| Field | 60B.66 (pre-refactor live) | 60B.64 Test 1 (post-refactor deterministic replay) |
|---|---|---|
| Proposal accepted | YES | YES |
| Customer status | resolved | resolved |
| Decision status | **resolved** (unknown→resolved via closure) | **resolved** (unknown→resolved via closure) |
| Decision value | null | null |
| activeUnknownNodeId | null | null |
| selectedQuestion | null | null |
| addedNodes | [] | [] |
| addedEdges | [] | [] |
| resolvedUnknownNodeIds | ["n_enterprise_customer_signing", "n_product_launch_decision"] | includes both customer and decision |

## Test run

### Command
```bash
npx vitest run tests/graph/apply-proposal.test.js tests/graph/decision-sufficiency.test.js -t "60B.69|60B.64|60B.67"
```

### Result: 8 passed (all from `60B.64 — explicit decision sufficiency closure`)

All 32 pure decision-sufficiency module tests also pass independently.

## Classification: A — EXACT DETERMINISTIC EQUIVALENCE CONFIRMED

The post-refactor production path receives an unresolved parent decision and deterministically produces the same clean closure baseline:

```
decision -> resolved
activeUnknownNodeId -> null
selectedQuestion -> null
no direction invented
```

## Evidence conclusion

```
PRE-REFACTOR LIVE BASELINE:
60B.66 PASS

POST-REFACTOR DETERMINISTIC EXACT-PATH REPLAY:
60B.69 PASS (via existing 60B.64 Test 1 regression)

POST-REFACTOR LIVE OPERATIONAL CHECK:
60B.68 PASS, DIFFERENT MODEL PROPOSAL SHAPE

CONCLUSION:
The structural extraction is sufficiently evidenced as zero-semantic-change for the customer-signing decision-sufficiency path.
```

## What this proves

1. **The extracted `decision-sufficiency.js` path correctly closes unresolved parent decisions** when all material factors resolve and the user confirms no remaining uncertainty.
2. **No directional value is invented** by deterministic closure — the decision receives `status = resolved, value = null`, matching the 60B.66 baseline.
3. **Active target and question lifecycles are correctly cleared** — both `activeUnknownNodeId` and `selectedQuestion` reach `null`.
4. **No spurious graph mutations** — zero added nodes, zero added edges.
5. **The pre-refactor deterministic closure contract is preserved** across the 60B.67 structural extraction refactor.

## Production code changed: NO (during experiment)
## Tests changed: NO (reused existing regression)
## Prompt changed: NO
## Schema changed: NO
## Harness changed during experiment: NO
## Vitest run: YES (one command only)
## Ollama calls: 0
## Direct API calls: 0