Career Ops UI

[1.58.50] — 2026-05-20

docs: DOC-1 — qa/REGRESSION-FINAL.md gets §5a documenting server error bodies as English-by-policy. v1.58.36 audit raised NEW-D4: every server 4xx body is English on every locale. Two paths: (A) confirm by-design, document the contract; (B) read Accept-Language and localize. The spec recommended A — closing NEW-D4 as not-a-finding is least disruption and keeps tests stable. New qa/REGRESSION-FINAL.md §5a section explains: server JSON error bodies stay English (debuggability boundary — bug reports paste cleanly, CI fixtures stay stable, server tests don't need parallel locale strings). The SPA wraps responses with localized chrome (toast colour, U-4 Details summary). Accept-Language is intentionally not read; the SPA-side lang is stripped before validateConfig per the v1.57.2 invariant. v1.59 option B (localized server errors with { error, error_en, code }) is the future gate. 946 → 947 unit. Closes the v1.58.37 → v1.58.50 queue from FIX-PROMPT-FINAL-EXHAUSTIVE.md — 14 single-fix releases shipped, every one CI-green + AI-review LGTM. (DOC-1)