Add deep interactive exploration mode for researcher

[IovetsNikolay]

performInteractiveExploration() purpose: Discover what each button/link actually DOES when clicked.
This could be baseline logic, after proof that it researches better

Algorithm:

1. Collect all interactive elements from ARIA snapshot
   • No AI call needed - direct parsing
2. For each element:
   • Click it
   • Detect result (navigation, modal, content change)
   • Record outcome
   • Return to original state
3. Generate structured report

Flow:
/research --deep

1. performDeepAnalysis() runs first:
   └── Expands hidden menus, dropdowns, accordions
   └── Documents what's inside them
2. performInteractiveExploration() runs after:
   └── Clicks visible buttons/links
   └── Documents what each one does
3. Combined output:
   └── Complete picture of page structure AND behavior