fix(windows): repair installer script, enable rustls, and automate releases

[1001encore]

Description

Closes #86

This PR provides a complete fix for Windows support, addressing both the installation script and the build process.

1. Fix Installer Script (scripts/install.ps1)

• The script was crashing on Windows PowerShell 5.1 because RuntimeInformation::OSArchitecture is not reliably available.
• Fix: Switched to standard $env:PROCESSOR_ARCHITECTURE check.

2. Fix Build Dependencies (Cargo.toml)

• cargo install was forcing users to download ~4GB of C++ Build Tools to compile OpenSSL.
• Fix: Configured git2 to use rustls and native Windows APIs (Schannel) on Windows targets. This allows pure Rust builds.

3. CI Automation (.github/workflows/release.yml)

• Added windows-latest to the release matrix and ensured dist-manifest.json is generated. This ensures future releases automatically support the install script.

4. Documentation (README.md)

• Added the one-line PowerShell install command to the Quick Start section.

Verification

• Installer: Ran install.ps1 locally; verified it correctly detects windows-x64 and downloads the binary.
• Build: Ran cargo build --release on a Windows machine; confirmed it builds without C++ tools.
• Runtime: Verified the resulting codanna.exe runs successfully.

[bartolli]

Thanks for the Windows support work - the Cargo.toml and PowerShell fixes are exactly what's needed.

A few changes requested:

1. Please revert the release.yml changes - I intentionally keep releases manual
2. The README PowerShell command has markdown link syntax inside the code block - please use the raw URL: irm https://raw.githubusercontent.com/bartolli/codanna/main/scripts/install.ps1 | iex

The git2 platform-specific config and install.ps1 architecture detection are good to merge once these are addressed.