WIP: adp: add authorization docs

[paulohtb6]

Description

Resolves https://redpandadata.atlassian.net/browse/DOC-1905
Review deadline: 6th of February 2026

Page previews

Agents - Concepts- Authorization
MCP - Concepts - Authorization
Create agent TIP

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch authz-adp

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[paulohtb6]

GitHub closed the PR because it has been integrated into adp-pkg1. But consider this still open/WIP.

[paulohtb6]

replaced with #494