fix: require CLI commands for all SDK methods

[masnwilliams]

Summary

• Remove the "internal/admin" exception from the CLI coverage workflow
• All SDK methods in api.md now require corresponding CLI commands with no exceptions

This fixes the issue where Agents.Auth, Agents.Auth.Invocations, and Credentials were being skipped as "internal/admin" when they should have CLI commands.

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Note

Tightens the CLI coverage workflow constraints.

• Updates update-cli-coverage.yml guidance to require CLI commands for every SDK method listed in api.md (no exceptions)
• Clarifies that streaming methods may use different CLI implementations (e.g., follow flags)
• Removes prior exception notes (internal/admin, etc.)

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