add reusable support for intent-aware iterative probes

Summary

There is currently no reusable support combining the multi-turn lifecycle of IterativeProbe with the runtime-selected intents provided by IntentProbe. There is no reusable abstraction combining these capabilities. Introduce reusable support for running one iterative technique across multiple intents.

Expected behavior

• Use active intents from the intent service in iterative attacks.
• Associate each root conversation with one intent.
• Preserve that intent across every follow-up turn, branch, and transformed attempt.
• Retain normal iterative behavior, including branching, termination limits and common probe hooks.
• Route completed attempts through intent-specific detectors and reporting.

Motivation

Technique/intent separation should also apply to adaptive and multi-turn attacks. Without shared support, each iterative intent-aware probe must duplicate orchestration.

A reusable contract would reduce duplication and provide consistent attempt metadata, detector routing and technique–intent reporting for future iterative techniques.