feat(ruby): add uru version manager detection

[CalvinAllen]

Blocked By

• refactor(migration): plugin-style architecture for version manager migration providers #128 - Plugin-style architecture for version manager migration providers

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Description

Add detection for uru, a lightweight Ruby version manager for Windows, to the migration provider system.

Currently, the migration system detects:

• System PATH (via LookPathExcludingShims)
• rbenv (Unix)
• rvm (Unix)
• chruby (Unix)

Windows users who use uru for Ruby version management are not detected.

What is uru?

uru is a lightweight, multi-platform Ruby version manager that works on Windows, Linux, and macOS. On Windows, it's one of the few options for managing multiple Ruby versions.

uru stores its configuration and managed Ruby paths in ~/.uru/.

Proposed Changes

Once #128 is implemented, create a new migration provider for uru:

• Create src/migrations/uru/provider.go
• Implement the MigrationProvider interface
• Check for ~/.uru directory
• Parse uru's configuration to find managed Ruby paths
• Return detected versions with source label "uru"

Acceptance Criteria

• Wait for refactor(migration): plugin-style architecture for version manager migration providers #128 (migration provider refactor) to be completed
• Research uru's configuration format and directory structure
• Create src/migrations/uru/provider.go implementing MigrationProvider
• Add import to src/main.go
• Add unit tests for uru detection
• Test on Windows with an actual uru installation (if possible)

Files Affected

• src/migrations/uru/provider.go (new)
• src/migrations/uru/provider_test.go (new)
• src/main.go (add import)