docs: Design-Spec v1 für What to Wear (WTW) + Projekt-Scaffolding

Brainstorming-Ergebnis der AI-Dev-Method (Phase 0/Design):
- HACS-Custom-Integration what_to_wear, Open-Source, standalone in Kunden-HA
- Kleiderschrank-Inventar (Sub-Entries), Regeln→Anforderungen→Matcher, optionaler LLM-Ton (BYO-Key)
- Wetter v1 aus HA-Wetter-Entität; Open-Meteo/LagerLens/CRUD-Karte = v1.1
- LEDGER inkl. Kritiker-Konsultation (gpt-5.6-luna-pro) zur Wetterquelle

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,29 @@
+# Python / HA custom component
+__pycache__/
+*.py[cod]
+.venv/
+venv/
+*.egg-info/
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+
+# HA test instance artifacts
+test-ha-config/.storage/
+test-ha-config/*.log
+test-ha-config/*.db*
+
+# Node / Lovelace-Karte (Build)
+node_modules/
+dist/
+
+# Secrets / lokale Umgebung — niemals committen
+.env
+*.env.local
+secrets.yaml
+
+# OS / Editor
+.DS_Store
+*.swp
+.idea/
+.vscode/