refactor(examples): replace sector-specific example material with generic, fictitious examples

The context sets, the packaged knowledge bases and the example bundles are
replaced by one fictitious example set about IT operations in an invented
organisation: three context sets (serverrom-2027, driftsavtale-2027 and the
two-base drift-og-avtale-2027), two synthetic knowledge bases under
src/portfolio_optimiser/data/kunnskapsbaser and two example bundles under
src/portfolio_optimiser/data/bundles. Numbers, codes and structural values in
tests and fixtures are kept; names, ids and wording change. Dated measurement
documents that only recorded runs on the replaced material are deleted.

Gate figures measured on the new set are not comparable with earlier ones.
The exclusion gate from the previous commit is green: 0 tracked files hit
outside the shared/ subtree.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/plan/2026-07-10-sesjonsplan-fase2-6.md

@@ -406,7 +406,7 @@ hva den blokkerer/åpner (ikke hele fasiten).
 - **Mål:** `affected_items` avstemmes fail-closed mot prosjektets faktiske kostbaseline — den
   deterministiske gaten kan ikke lenger mates med hallusinerte kostlinjer.
 - **Scope:** baseline-projeksjon i bundle (`cost-baseline.json`: code→{quantity, unit_cost} —
-  commons-amendment) + fra `reference_domain.cost_items` på road-stien; ny avstemmings-stage i
+  commons-amendment) + fra `reference_domain.cost_items` på referanse-stien; ny avstemmings-stage i
   `validate_proposal` (kode finnes ikke i baseline → Rejection; quantity/unit_cost utenfor
   toleranse → Rejection; toleranse konfig); metode-registry: metode-caps keyes via
   dimensjon/konfig, ikke strengen `energy_efficiency` (F8). Baseline-argument er VALGFRITT i