Add loyalty guidance for facilitating users switching UAs

[csarven]

Closes #5

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[martinthomson]

I think that this is a little too narrow, because it ignores other ways in which browsers lock users in. Features, especially integrations, are a concern. Data portability is a problem that each browser seems to have solved for their own ends.

[Copilot]

Pull Request Overview

This PR adds a loyalty guidance requirement to prevent user agents from obstructing users who want to switch to different user agents. The change addresses data portability and user freedom concerns raised in the linked issue.

• Adds a normative "must not" requirement for user agents to avoid blocking user switching
• Specifies that user agents cannot store data in formats that prevent portability
• Lists specific types of user data that must remain portable (identity, bookmarks, history, passwords)

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[Copilot]

Pull Request Overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.

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[marcoscaceres]

One suggestion, otherwise looks good to me.

[marcoscaceres]

@csarven I think you are good to go here.