# ultrareview determinism fixtures

Synthetic fixtures for the Jaccard-similarity determinism test in
`tests/lib/review-determinism.test.mjs`.

## What's here

- `review-run-A.md` — synthetic review with 5 findings on a fictional JWT auth task
- `review-run-B.md` — same fictional task, "re-reviewed" — same 5 findings as A plus 1 extra (a placeholder TODO that A missed)

## Construction

Run A's finding-IDs are a strict subset of Run B's (`A ⊂ B`), so:

- Intersection: `|A ∩ B| = 5`
- Union: `|A ∪ B| = 6`
- Jaccard: `5 / 6 = 0.833…` (above the 0.70 SC4 threshold from `brief.md`)

Each ID is a real 40-char SHA1 computed via `lib/parsers/finding-id.mjs`:
`sha1(file:line:rule_key)`. Don't hand-edit the IDs — recompute via the helper if
you change the underlying `(file, line, rule_key)` triplet, or both fixtures will
fall out of sync.

## Why synthetic for v1.0

Hand-curated for v1.0. Edit JSON IDs directly to test new Jaccard scenarios.
Real-LLM determinism measurement is deferred to v1.1 once `/ultrareview-local`
has produced enough real outputs to capture as fixtures.

These fixtures prove the Jaccard PIPELINE works given a known input — they do
NOT measure real LLM determinism. The brief's SC4 (Jaccard ≥ 0.70 across two
runs) is verified at the pipeline level today; capturing real LLM runs to
verify the model-level claim is open work for v1.1.

## Adding a new scenario

1. Pick `(file, line, rule_key)` triplets — `rule_key` must be one of the 12
   keys in `lib/review/rule-catalogue.mjs`.
2. Compute IDs via:
   ```bash
   node -e "import('./lib/parsers/finding-id.mjs').then(({computeFindingId}) => console.log(computeFindingId('lib/foo.mjs', 42, 'SECURITY_INJECTION')))"
   ```
3. Add the IDs to `findings:` block-style YAML in frontmatter and to `### <id>`
   subsections in the body.
4. Run `node lib/validators/review-validator.mjs --json tests/fixtures/ultrareview/review-run-X.md`
   to confirm the fixture validates.
5. Update `tests/lib/review-determinism.test.mjs` if you want a new assertion.
