# JWST diagnostic record — v23 bundle hardening

This record preserves the JWST UVLF diagnostic that is actually reproducible from the shipped historical bundle without promoting it to a physical PASS that the source record did not define.

## Reproducible historical diagnostic

The archived `datasets/ledger.jsonl` identifies the inputs by SHA-256:

- `JWST_UVLF_like/jwst_uvlf_data.csv`: `e2b9039016e6843efd200e3a5e78809cf1e0d4a9bb50009e68c8cfa7bd4e7d96`
- `JWST_UVLF_like/jwst_uvlf_theory.csv`: `3ca77706eb2d97e9cacb5084f96bc86d3c380e3f824c096969c5e5aa7e2451fe`

These eight points reproduce:

- chi2 = 5.511946476301458
- n / historical assumed nu = 8
- chi2 / 8 = 0.6889933095376822
- RMS residual = 0.10348530589493715

The archived report explicitly states `PASS: UNDECIDED (no explicit threshold/rule in ZIP)`.

## Important boundary

This diagnostic is therefore not promoted to a physical JWST gate PASS. The v23 executable gate checks only that the archived diagnostic is reproducible and that its open scientific status is preserved.

A separate three-point root `datasets/jwst_uvlf_*.csv` pair is not substituted for the archived eight-point diagnostic. It has different hashes and a different numerical result.

The dated manuscript also contains a historical headline `JWST (diag.) chi2/nu = 1.102`. No executable artifact in the current bundle was found that reproduces that number. It remains a manuscript-history item to reconcile when Ronald L. Alexander updates the v23 public document; it is not silently replaced here.
