v0.2.1: Add MIT license to template package

Fixes the "License missing" warning from dotnet pack by declaring
PackageLicenseExpression and shipping LICENSE in the nupkg.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

v0.2.0: Restructure template layout and add CLAUDE.md

Flatten template payload to templates/csharp/ root, drop the duplicate
root-level S2SModTemplate/ project, inline the ILSpy skill into
install_skills.sh, and replace AGENTS.md with CLAUDE.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

v0.1.0

Remove local Codex file