add windows HKEY support

[tommyjcarpenter]

Add a new optional shell_menu_cleanup section to the config schema for declaring Windows Explorer right-click (shell) menu cleanup state. Windows-only, like file_associations; it captures the three distinct places a shell verb can hide so they can be cleaned up declaratively rather than by hand.

The section nests under a windows key and exposes three arrays, one per mechanism:

• com_handlers_blocked: CLSIDs written as empty REG_SZ value names under HKLM\Software\Microsoft\Windows\CurrentVersion\Shell Extensions\Blocked.
• static_verbs_disabled: registry verb keys that get an empty LegacyDisable REG_SZ, hiding the verb without deleting the key; treated as already-done when the key is absent on the current machine.
• appx_packages_removed: wildcard package-name patterns fed to Get-AppxPackage | Remove-AppxPackage for MSIX-packaged shell extensions.

Each entry requires only its identifying field (clsid / path / name_pattern); an optional name is carried for log readability. Every level sets additionalProperties: false, so a typo'd array key or OS section fails validation rather than being silently skipped, consistent with the rest of the schema.

Changes:

• bootstrap/schema.py: new shell_menu_cleanup top-level section plus three definitions (shell_menu_com_handler, shell_menu_static_verb, shell_menu_appx_package).
• tests/test_schema.py: new TestShellMenuCleanupSchema with positive cases (full and required-only) and negative cases (missing required field, unknown property, unknown OS section).

[Copilot]

Pull request overview

Adds a new optional configuration section to the JSON schema for describing Windows Explorer right‑click (shell) menu cleanup actions, including registry-based verb disabling and uninstalling AppX/MSIX shell extensions.

Changes:

• Introduces a new top-level shell_menu_cleanup section (Windows-only) in the schema.
• Adds three new schema definitions to validate COM handler CLSIDs, static verb registry paths, and AppX package name patterns.

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[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.