docs: add CHANGELOG.md with initial release notes

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Integration tests with `pytest-httpx` for mocking HTTP interactions
+- Enum types for status, severity, and other string constants in models
+- CI/CD publish job enabled with OIDC Trusted Publishing for PyPI
+
+### Changed
+- Extracted CLI utilities into `cli_commands` package for better modularity
+- Replaced string constants with proper Enum types (`StatusEnum`, `SeverityEnum`, etc.)
+
+### Fixed
+- Enabled PyPI publication workflow (previously commented out)
+
+## [0.1.0] - 2026-08-12
+
+### Added
+- Initial release of netsleuth
+- Cross-platform network diagnostics CLI
+- Identity detection (IPv4/IPv6, ASN, geo, organization)
+- VPN/proxy assessment with weighted verdicts
+- DNS leak testing per network adapter
+- BGP intelligence (upstreams, peers, downstreams, IXP presence)
+- Reputation checks (FireHOL, Shodan InternetDB, DNSBL)
+- Latency and path analysis (ping, traceroute)
+- Bandwidth testing with cascading speedtest
+- TLS handshake RTT measurement
+- DNS comparison (system vs DoH)
+- Path diversity analysis via Cloudflare edge PoP
+- AS prefix benchmarking
+- DPI/port self-check for owned servers
+- Continuous monitoring mode with live dashboard
+- Report comparison for before/after analysis
+- Multi-format output (Markdown English/Russian, JSON)
+- Interface binding for VPN vs raw connection comparison