test(m2): build the eight-case fixture workspace

Eight cases, one per build-brief 6 state, dated relative to 2026-09-15. One
of them (havbris) carries frontmatter that deliberately disagrees with its
log, so the derived-truth rule has a fixture instead of only a docstring. One
(vaeroy-sjomat) is named for an employer with ae, o-slash and a-ring, so the
ASCII path rule has teeth on macOS NFD.

Six beslutninger.jsonl fixtures for M6's counting rules are written now, in
M2, because the store is append-only: type, skjema, delscore and vekt_hash
have to be right at the first write or they are wrong forever.

Co-Authored-By: Claude <claude-opus-5>

tests/fixtures/workspace/saker/2026-09-storelva-kommune-fagleder-digitalisering/sak.md

@@ -0,0 +1,35 @@
+---
+sak_id: 2026-09-storelva-kommune-fagleder-digitalisering
+arbeidsgiver: Storelva kommune
+rolle: Fagleder digitalisering
+kilde: manuell
+url: https://stillinger.example/storelva-17
+opprettet: 2026-08-06
+status: dialog
+neste_frist: 2026-08-28
+ventende_part: dem
+sist_aktivitet: 2026-08-22
+score: 63
+cv_variant: cv-generell-v3
+soknad_versjon: v1
+---
+
+## Hvorfor denne
+
+Offentlig virksomhet med et reelt digitaliseringsmandat.
+
+## Status naa
+
+Generert fikstur. Proveniens: syntetisk, skrevet for testkorpuset.
+
+## Neste handling
+
+Avventer det statusmaskinen utleder fra logg.jsonl.
+
+## Aapne sporsmaal
+
+- Ingen.
+
+## Tidslinje
+
+Genereres fra logg.jsonl.