Add WSL locations to index

[SUSTAPLE117]

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[Copilot]

Pull request overview

Adds Windows Subsystem for Linux (WSL) home-directory discovery so Bagel’s file index (and downstream secret scanning) can include Linux homes accessible from a Windows host, gated by a new file_index.scan_wsl config flag.

Changes:

• Introduces a new pkg/wsl package to enumerate registered WSL distros (Windows) and generate UNC roots for their /home and /root directories.
• Adds scan_wsl to FileIndexConfig with a default of true, and appends discovered WSL base dirs during file-index construction.
• Adds unit tests for UNC candidate ordering and Docker Desktop distro skipping.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/wsl/wsl.go	Defines UNC root candidates and filtering for system/internal distros.
pkg/wsl/wsl_windows.go	Implements Windows registry-based distro discovery and UNC reachability probing.
pkg/wsl/wsl_other.go	Provides non-Windows no-op stub for WSL discovery.
pkg/wsl/wsl_test.go	Adds unit tests for UNC candidate ordering and distro skip logic.
pkg/models/config.go	Adds ScanWSL to file index configuration model.
pkg/config/config.go	Sets default file_index.scan_wsl to true.
pkg/collector/collector.go	Appends WSL-discovered home roots to the file index base directories when enabled.

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