feat(ci): add mutation testing workflow for Stryker.NET

[samtrion]

Summary by CodeRabbit

• Chores
  • Added automated mutation testing workflow for .NET projects with configurable settings and optional dashboard integration.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 1e495bac-561a-4146-a12e-5c66553b8d20

📥 Commits

Reviewing files that changed from the base of the PR and between 4871d28 and 8541af8.

📒 Files selected for processing (1)

• .github/workflows/mutation-dotnet.yml

Walkthrough

A new reusable GitHub Actions workflow file for Stryker.NET mutation testing was added. The workflow triggers on workflow_call, accepts an optional configuration file path, requires a dashboard API key secret, implements concurrency controls with in-progress run cancellation, and conditionally executes mutation testing based on configuration file presence.

Changes

Cohort / File(s)	Summary
Stryker.NET Mutation Testing Workflow .github/workflows/mutation-dotnet.yml	Added reusable workflow with configurable input for Stryker config file path, concurrency grouping by workflow ref and config file, environment variables for deterministic .NET execution, and conditional step to run dotnet-stryker-action when config file exists.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A workflow hops into the fold,
Stryker's mutations to be bold,
Concurrency keeps runners neat,
Dashboard metrics—oh, how sweet!
Config files guide the test's way,
Mutation testing here to stay! ✨

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