feat: model core, launcher, reproduction check and the first two skills

The core in modell/kjerne/ is an unmodified copy of sim.py, diagnose.py and
forlop.py from den-dynamiske-rettsstaten @2badc25, pinned by sha256.
kjor.py is the single entry point; kontroll.py reproduces the note's 22 data
files and printed results. Skills: diagnose and forlop (Norwegian).

Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,26 @@
+.env
+.env.*
+!.env.template
+*.local.md
+.DS_Store
+
+# Operator's private files: never committed
+/STATE.md
+/REMEMBER.md
+/MEMORY.md
+/PLAN.md
+/.session-state.local.json
+/.claude/settings.local.json
+/private/
+
+# Python
+.venv/
+__pycache__/
+*.pyc
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+
+# Results written by the scenario runner and working copies made while testing
+/resultater/
+/rettsstat-modell/