Fix interactionMode enum and description

[marco-agile]

Description

This pull request addresses an inconsistency in the interactionMode field within the AgentDescriptor schema.

Changes include:

• Added "Autonomous" as a valid enum value with a clear definition, indicating agents that act independently without human intervention.
• Fixed incorrect references to executionMode that should have been interactionMode for clarity and consistency.
• Fixed a minor typo in the enum description.

These changes improve schema clarity, avoid validation issues, and better align the agent descriptor with expected agent behaviors.