csharp git:20261010.87e53aaA

Immutable. This exact content never changes and is served at /api/v1/blob/fbbe3b486b855989.

---
description: C# / .NET coding standards (Frontier)
globs: **/*.cs,**/*.csx
alwaysApply: false
---

# C# / .NET (Frontier)

Canonical: `.github/instructions/csharp.instructions.md` and
`.github/skills/languages/csharp/SKILL.md` -- read through
`pwsh -NoProfile -File .frontier/runtime/frontier.ps1 cursor read <canonical-path>`.

- Nullable reference types enabled; async/await end to end (no `.Result`).
- Dependency injection; EF Core with parameterized queries only.
- XML docs on public APIs; xUnit tests; catch specific exceptions.
- Secrets via configuration/Key Vault, never hardcoded.