release: v1.6.1 - Weather forecasts, sun times, air quality

- Weather fetch now returns 7-day forecasts with UV index
- New /volatile/fetch/sun/{city} endpoint for sunrise/sunset
- New /volatile/fetch/air_quality/{city} endpoint for AQI and pollutants
- OpenMeteoProvider now implements AirQualityProvider interface

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "library-desk"
-version = "1.6.0"
+version = "1.6.1"
 description = "Coordination service for The Library system - HybridRAG queries, document ingestion, entity extraction, and knowledge consolidation"
 readme = "README.md"
 requires-python = ">=3.12"