Fix #686 - Clarify decision logic around agentic route selection

[benbrown]

I thought the syntax of the route selection logic was a bit confusing, so I expanded it.

Previously it was

!isAgenticRoute || Activity.isAgenticRequest

The right hand side implies isAgenticRoute is true AND the request isAgentic. The invisible isAgenticRoute was confusing to my simple mortal brain so I put it in.

[Copilot]

Pull Request Overview

This PR clarifies the boolean logic for agentic route selection by making the implicit condition explicit. The change transforms !isAgenticRoute || context.activity.isAgenticRequest() into !isAgenticRoute || (isAgenticRoute && context.activity.isAgenticRequest()) throughout the codebase to make the logic more readable and easier to understand.

Key Changes

• Expanded the boolean expression in route selection logic to explicitly show that isAgenticRequest() is only evaluated when isAgenticRoute is true
• Applied this clarification consistently across all route selector functions in the AgentApplication class

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