[submit] Example: Add reasoning to attacker, two-pass defense to defender

[sofasogood]

What this PR shows

This is an example submission so participants can see exactly what files to change and what a Phase 2 submission looks like.

Attacker change (agents/attacker/agent.py)

• Added a reasoning step before generating the attack
• The attacker first analyzes the scenario, defender profile, and previous failed attempts to decide on a strategy
• Then generates the actual attack informed by that reasoning
• Uses 2 of the 4 available LLM requests per round

Defender change (agents/defender/agent.py)

• Added a two-pass defense
• First pass: analyze the input for manipulation attempts (prompt injection, social engineering, hidden instructions)
• Second pass: respond to the input with the security analysis in mind
• Uses 2 of the 4 available LLM requests per round

What to notice

• Only files inside agents/attacker/ and agents/defender/ were modified
• No changes to the orchestrator, plugins, or any other framework files
• The commit message starts with [submit] which triggers the submission workflow
• You can also use [submit-attacker] or [submit-defender] to submit just one agent