# Phase `cf48` — Opus 4.8 post-cfold coverage-loss review

**Mission:** run a SECOND, independent post-cfold coverage-loss review — identical in scope
to phase `cf55`, but performed by **Claude Opus 4.8** instead of GPT-5.5 — so the cfold
custom-folder collapse is cross-validated by two different models. Confirm no custom test,
assertion, fixture, screenshot hook, lifecycle overlay, or result-level behavior was lost.
Review-only: do not implement new feature work unless the review finds a concrete regression
that must be fixed before continuing.

State files live under `machine-docs/`: `STATUS-cf48.md`, `BACKLOG-cf48.md`,
`REVIEW-cf48.md`, `JOURNAL-cf48.md`.

## Model Requirement

This phase must run on **Claude Opus 4.8** (`claude-opus-4-8`), on the **`claude`** backend
(NOT opencode). The orchestrator sets per-phase model override files:

- `/srv/cc-ci/.cc-ci-logs/.loop-model-cf48 = claude-opus-4-8`
- `/srv/cc-ci/.cc-ci-logs/.loop-model-adv-cf48 = claude-opus-4-8`

and must ensure `.loop-backend = claude` is in effect when this phase starts (per-phase
backend is not overridable in launch.py; if the loops were on opencode for cf55, the
orchestrator restarts them on the claude backend before cf48). Builder and Adversary should
record the model their session reports in their first `STATUS-cf48.md` / `REVIEW-cf48.md`
entries; if it is not Opus 4.8, stop and ask the orchestrator to fix the launcher state.

## Inputs

- `plan-phase-cfold-custom-folder.md`
- `machine-docs/STATUS-cfold.md`, `machine-docs/REVIEW-cfold.md`
- the final cfold implementation commits on cc-ci main
- the pre-cfold baseline matrix recorded by cfold (custom tests across all enrolled recipes)
- any cfold full-sweep evidence and artifacts
- **`machine-docs/STATUS-cf55.md` / `REVIEW-cf55.md`** — the GPT-5.5 review. Read it, but
  review INDEPENDENTLY first and form your own verdict; THEN reconcile: note any place the
  two models disagree (a finding one caught and the other missed is itself worth surfacing).

## Required Review

Same seven categories as `cf55` — review them independently, do not just confirm cf55:
1. **Diff review** — exact cfold commit range, line-by-line for coverage loss (discovery,
   manifest/reporting, docs, unit tests, imports, fixtures, lifecycle overlays, screenshot
   hooks, result rendering).
2. **Discovery parity** — recompute the discovered custom-test inventory after cfold vs the
   pre-cfold baseline: same recipes, same custom-test count, same assertions, same helper
   coverage, only folder paths changed `functional/`|`playwright/` → `custom/`.
3. **Assertion preservation** — no weakened/removed assertions, skipped tests, relaxed waits,
   or renamed tests without equivalent coverage. Mechanical import/path updates are allowed.
4. **Old-folder behavior** — deprecated `functional/`/`playwright/` handled exactly as cfold
   decided: no silent coverage loss for recipe-local tests; loud warnings / documented compat.
5. **Lifecycle-overlay separation** — top-level lifecycle overlays stay distinct from custom
   tests and were not moved into / discovered through `custom/`.
6. **Evidence audit** — verify cfold's claimed full sweep actually ran custom tests with no
   silent level drops; classify any skip/level change as expected, cfold-neutral, or blocker.
7. **Cleanliness** — no unintended root coordination files, leaked test stacks, stale temp
   scripts, or uncommitted implementation files.

## Gates

**M1 — Opus 4.8 cold review complete.** Builder produces a review matrix in `STATUS-cf48.md`
covering every recipe and every category above, plus a short cf55-vs-cf48 agreement note.
Adversary independently verifies and records PASS/FAIL in `REVIEW-cf48.md`.

**M2 — No-loss verdict.** Adversary either confirms `NO COVERAGE LOST` with concrete
evidence, or records specific blocking findings. If findings exist, Builder fixes only those,
evidence is refreshed, Adversary re-checks. No move to `pvfix` until M2 has a fresh PASS.

## Guardrails

- Review pass, not a redesign. Minimal fixes, directly tied to a found regression.
- Do not weaken or delete tests to make the review pass.
- Do not rerun a full fleet sweep unless the existing cfold evidence is incomplete or the
  review finds a specific reason it must be repeated.
- Do not touch proxy/ghost work here; those are queued after this review.

## Definition of Done

`STATUS-cf48.md` contains the Opus 4.8 review matrix + final verdict (incl. cf55 agreement
note), `REVIEW-cf48.md` contains Adversary's independent Opus 4.8 PASS, and the verdict
explicitly states whether cfold preserved the full pre-cfold custom-test set. Builder writes
`## DONE` only after Adversary records M1 and M2 PASSes.