Brummel
8348e33264
Smoke-testing invented German dictations exposed that `ae`/`oe`/`ue` spellings collapsed lexical recall (e.g. "Hyperlipidaemie" → garbage, "Hyperlipidämie" → correct). normalize() now folds ä→ae, ö→oe, ü→ue, ß→ss; it is applied only in lexical.rs (both corpus index and query), so the path is symmetric under either spelling. The embedding path (raw text for bge-m3) is intentionally untouched. eval.rs inject_errors case 2 changed from umlaut-deletion (ä→a) to the realistic ASCII-digraph variant (ä→ae) so the eval harness exercises — and guards against regression of — exactly this failure class. TDD: failing tests first; normalize_tests 5/5, full suite 44/0. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>