# Phase 170.2 Plan: E2E Evidence and Regression Closure

**Status:** In Progress
**Date:** 2026-04-14
**Axis:** Axis 4 (human evidence) + Axis 3 (durable regression surfaces)

## Goal

Turn all proof lanes into durable replayable acceptance evidence, with
postmortem artifacts that make future regression checking mechanical.

## Depends On

- Phase 170 (three positive-mode proof lane bootstraps) — DONE
- Phase 170.1 (negative-result proof lane) — DONE

## Steps

### Step 1: Write durable receipts for each positive lane

Write `receipt-lane-a.md`, `receipt-lane-b.md`, `receipt-lane-c.md` into
Phase 170's `evidence/` subdirectories. Each receipt captures:

- Topic slug and research mode
- Bootstrap conformance result (27/27)
- Runtime topic state pointer
- Runbook reference
- What was proven and what remains

### Step 2: Write cross-reference receipt for negative-result lane

Write `receipt-lane-d.md` into Phase 170.2 evidence, cross-referencing the
Phase 170.1 receipt while adding the cross-lane regression context.

### Step 3: Write master regression runbook (RUNBOOK-E)

A single runbook that provides mechanical replay steps for all four lanes:

- How to re-bootstrap each topic through the public front door
- How to verify conformance
- How to replay the negative-result pipeline
- What acceptance checks to run

### Step 4: Write cross-lane postmortem

A postmortem document covering:

- What worked across all lanes
- What gaps or friction points surfaced
- What future work is needed
- Honest assessment of what was NOT proven

### Step 5: Write SUMMARY.md and update state

- Phase 170.2 SUMMARY.md
- Update STATE.md to reflect 3/3 phases complete (100%)
- Mark Phase 170.2 plan as done in ROADMAP.md

## Acceptance Criteria

- [x] Durable receipt for Lane A (formal_derivation)
- [x] Durable receipt for Lane B (toy_model)
- [x] Durable receipt for Lane C (first_principles)
- [x] Durable receipt for Lane D (negative_result)
- [x] Master regression runbook (RUNBOOK-E)
- [x] Cross-lane postmortem
- [x] Phase 170.2 SUMMARY.md
- [x] STATE.md and ROADMAP.md updated
