Fix: remove the non-existent portal apps list command from the Skills

[QuantumFUD]

Description
The Skills documentation contained examples and tips for the portal apps list command and the portal.apps.list schema, neither of which exist in the CLI registry.

This change aligns the skills with the actual CLI interface:

• app list is used to search for/retrieve a list of applications (live Portal apps combined with the shipped catalog and skillRefs),
• the actual portal streams list and portal user-profile get remain for streams and profiles,
• in the “find appId” step of upvoting-on-abstract, the reference now points only to app list.

[vercel]

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[cursor]

PR Summary

Low Risk
Documentation-only updates that rename CLI commands and remove references to a non-existent portal apps list/portal.apps.list schema; no runtime behavior changes.

Overview
Updates AGW CLI skill docs to align with the actual command registry by removing references to the non-existent portal apps list command and portal.apps.list schema.

discovering-abstract-portal now directs app discovery to agw-cli app list/agw-cli app show (and keeps portal streams list/portal user-profile get for live Portal reads), and upvoting-on-abstract now points the “find appId” step solely to agw-cli app list.

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