FIX: give adaptive technique selection the run id on fresh runs

[Utkarsh Bahuguna (u7k4rs6)]

Fixes #3093.

• ScenarioContext gets scenario_result_id: the stored id on resume, or the id the new result will use on a fresh run.
• initialize_async picks that id with uuid4() before building attacks and creates the ScenarioResult with it, so the id the attacks saw is the one that gets saved.
• AdaptiveScenario hands context.scenario_result_id to the dispatcher instead of self._scenario_result_id, which is still None at that point on a fresh run.

Same repro on this branch:

fresh run ids passed to selector: {'bd4cd586-...'}
two fresh runs picked identically: False
resume picks match original: True | resume error: None

Test: a seeded TextAdaptive run passes its own result id to the selector, and resuming it makes the same picks. It fails on main. tests/unit/scenario and backend: 3814 passed.