docs: updated broker credentials comparison

[rishabhraj36]

Description

Refines the “Authsome vs other agent credential brokers” section in the comparison docs.

The update makes the OneCLI and Agent Vault comparison more accurate by focusing on operating model, OAuth ergonomics, runtime delivery, deployment posture, and team workflows instead of using overly broad yes/no feature claims.

Motivation and Context

Users evaluating Authsome alongside other open-source agent credential brokers need a fair, accurate comparison that helps them choose the right tool without misrepresenting adjacent projects.

Closes #417.

How Has This Been Tested?

• Verified the claims against the local OneCLI repo code/docs.
• Verified the claims against the local Agent Vault repo code/docs.
• Ran git diff --check -- docs/site/compared.mdx.
• Ran mint broken-links.
• Ran mint validate.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• All new and existing tests passed.

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