0.53.0

[mivano]

What's New in 0.53.0

🚀 Framework Updates

• Dropped .NET 9, added .NET 10 — now targets net8.0 and net10.0
• Updated CI workflows for .NET 10 SDK

🐛 Bug Fixes

• Fixed regions command 403 error — added User-Agent header to RegionsApi HttpClient (datacenters.microsoft.com now requires it)
• Fixed subscription validation — commands now validate and auto-resolve subscription ID from Azure CLI when not specified
• Fixed NotImplementedException in Text and Markdown formatters for WriteRegions, WriteCostByTag, and WritePricesPerRegion
• Fixed --from/--to parameter handling — automatically sets timeframe to Custom when date parameters are provided

✨ Improvements

• Rewrote DevTest what-if command — now uses usage details API with proper meter-level price comparison instead of broken cost-based comparison. Enabled as what-if devtest subcommand.
• Added dedicated DevTest comparison output — all 5 formatters (Console, JSON, Text, Markdown, CSV) show resource-level savings with totals
• Extracted shared infrastructure — new CommandHelpers and OutputFormatterFactory reduce ~267 lines of duplication across 11 commands

📦 Dependency Updates

• Spectre.Console.Cli → 0.55.0 (with breaking change adaptations)
• Azure.Identity → 1.17.1
• Polly → 8.6.5
• Azure.Monitor.Query → 1.6.1
• Humanizer.Core → 2.14.1
• System.Linq.Async → 6.0.1
• actions/checkout → v6
• actions/upload-artifact → v6

📝 Documentation

• Updated AGENTS.md with build/test/run instructions for net10.0
• Updated README.md with prerequisites section and DevTest what-if documentation
• Added disclaimer about subscription compatibility

🧪 Testing

• Added 25+ new tests for shared infrastructure, formatter implementations, and command validation
• Enabled CI coverage threshold enforcement (75% minimum)

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This discussion was created from the release 0.53.0.