Scope AutoResearch history to the target leaf

[FluffyAIcode]

Summary

• inject only prior ISSUE_RESPONSE/ISSUE_VERDICT sections for the selected proof leaf into Generator context
• keep external Critic issues as explicit current steering instead of mixing them into historical Critic text
• preserve full current Generator output for Critic review while preventing unrelated RH-C1–C5 branches from repeating

Test plan

• python3 -m pytest -q tests/inference_engine/bridge/test_agent_gan_repl.py tests/inference_engine/bench/test_autoresearch_supervisor.py
• python3 -m py_compile scripts/agent_gan_repl.py
• verified RH-C1 history is excluded when RH-C2 child is targeted

The uncommitted candidate.py change is the active supervisor's runtime candidate and is intentionally excluded from this PR.

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