Implement DeepClean: Cross-platform dotnet global tool for cleaning bin/obj folders

[Copilot]

Creates a dotnet global tool that recursively deletes bin and obj folders from the current directory, with robust error handling and cross-platform support.

Implementation

Console Application (DeepClean/)

• Configured as dotnet global tool with command name deepclean
• Recursively finds and deletes bin/obj folders
• Options: --dry-run (preview), --yes (skip confirmation), --help
• Reports freed space in human-readable format

Error Handling

• Catches and reports file locks (IOException) without failing
• Handles permission errors (UnauthorizedAccessException)
• Tolerates path length issues and inaccessible directories
• Uses recursive size calculation with per-file/directory exception handling

CI/CD (.github/workflows/)

• ci.yml: Matrix build on Ubuntu/Windows/macOS with smoke tests
• publish.yml: Publishes to NuGet on release, auto-extracts version from tags
• Both workflows use explicit permissions per security best practices

Usage

# Install globally
dotnet tool install -g DeepClean

# Preview deletions
deepclean --dry-run

# Delete without prompt
deepclean --yes

Example output:

Found 8 folder(s) to delete:
  - /path/to/Project1/bin
  - /path/to/Project1/obj
  ...

Summary:
  Deleted: 8 folder(s)
  Freed space: 1.23 GB

Original prompt

I want to create a console app that can be installed as dotnet global tool that recursively and forcibly deletes bin and obj folders from the current path. Should include a GitHub Actions workflow to publish a nuget package. Should work on any OS. Should catch and handle any predictable errors, like file locks, requires elevation, etc., and report those to the user rather than failing opaquely.

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[matt-goldman]

LGTM