Add release process and branch strategy documentation

Add CONTRIBUTING.md and GitHub templates

Add GitHub Actions CI workflow for Linux builds and tests

Improve code examples: clarify checksum calculation and generic pattern

Fix ARCHITECTURE.md based on review feedback: correct API examples and clarify internal types

Add clarifying notes about struct examples and System.Net.IPAddress usage

Clarify System.Net.IPAddress usage and fix Tcp struct name

Improve ARCHITECTURE.md: clarify IPAddress naming and use ASCII arrows

Fix typo: IPAdress -> IPAddress in ARCHITECTURE.md

Fix trailing whitespace in ARCHITECTURE.md

Add comprehensive architecture guide documentation

Add cache-dependency-path for NuGet lock files

Enable NuGet lock files for CI cache support

Fix CI workflow based on review feedback

Add explicit permissions block to CI workflow for security