feat: add /tools/news endpoint for news ticker integration

- Add NewsHeadline and NewsResponse schemas
- Add NewsService for parsing news from Qdrant volatile collection
- Add GET /tools/news endpoint to tools controller
- News fetched from 'news' namespace in volatile_{user} collection

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

CHANGELOG.md

@@ -5,6 +5,19 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.11.0] - 2026-01-08
+
+### Added
+
+- **News Headlines API** - New endpoint for news ticker integration
+  - `GET /tools/news` - Fetch news headlines from user's volatile collection
+  - Returns headlines with title, description, source, and URL
+  - Data sourced from `volatile_{user}` Qdrant collection (news namespace)
+  - Uses `preferred_username` from OIDC, falls back to `default`
+- News subdomain under tools (`src/domains/tools/news/`)
+- `NewsHeadline` and `NewsResponse` Pydantic schemas
+- `NewsService` for parsing news data from Qdrant
+
 ## [1.10.12] - 2026-01-08
 
 ### Fixed