Policies tidying (#6587)

# Description of Changes
* Improve typing of API (breaking change but unreleased, frontend also
updated in this PR)
* Add ownership concept to policies
* De-AI the comments
* Update the `task dev:saas` rule to spawn the engine as well

frontend/editor/public/locales/en-GB/translation.toml

@@ -3077,14 +3077,6 @@ addTo = "Add to"
 hint = "Pick your client, paste the snippet into the file shown, then restart it. You'll sign in with your Stirling account on first use - no keys to copy."
 title = "Connect your AI assistant"
 
-[config.mcp.tools]
-ai = "AI"
-convert = "Convert"
-misc = "Misc"
-pages = "Pages"
-security = "Security"
-title = "What your assistant can do"
-
 [config.overview]
 description = "Current application settings and configuration details."
 error = "Error"
@@ -8193,9 +8185,6 @@ confirm = "Extract"
 message = "This ZIP contains {{count}} files. Extract anyway?"
 title = "Large ZIP File"
 
-[policies]
-sidebarTitle = "Policies"
-
 [watchedFolders]
 alreadyInFolder = "Already in this folder"
 deleteConfirmBody = "This will remove the folder and its run history. Files already downloaded are not affected."