Changes

PR #1944 by ksylvan: Add Infermatic AI Provider Support

• Add Infermatic provider to ProviderMap as part of Phase 1 implementation for issue #1033
• Add test coverage for the Infermatic AI provider in TestCreateClient to verify provider exists and creates valid client
• Replace go-git status API with native git status --porcelain command to fix worktree compatibility issues
• Simplify IsWorkingDirectoryClean and GetStatusDetails functions to use CLI output parsing instead of go-git library
• Use native git rev-parse HEAD to get commit hash after commit and remove unused imports from walker.go