Add searxng skill with portable configuration

skills/searxng/CHANGELOG.md

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+# Changelog
+
+All notable changes to the SearXNG skill will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.1] - 2026-01-26
+
+### Changed
+- **Security:** Changed default SEARXNG_URL from hardcoded private URL to generic `http://localhost:8080`
+- **Configuration:** Made SEARXNG_URL required configuration (no private default)
+- Updated all documentation to emphasize configuration requirement
+- Removed hardcoded private URL from all documentation
+
+### Security
+- Eliminated exposure of private SearXNG instance URL in published code
+
+## [1.0.0] - 2026-01-26
+
+### Added
+- Initial release
+- Web search via local SearXNG instance
+- Multiple search categories (general, images, videos, news, map, music, files, it, science)
+- Time range filters (day, week, month, year)
+- Rich table output with result snippets
+- JSON output mode for programmatic use
+- SSL self-signed certificate support
+- Configurable SearXNG instance URL via SEARXNG_URL env var
+- Comprehensive error handling
+- Rich CLI with argparse
+
+### Features
+- Privacy-focused (all searches local)
+- No API keys required
+- Multi-engine result aggregation
+- Beautiful formatted output
+- Language selection support