feat(dual-solve): surface engine logs

[plind-junior]

adds engine output logs and a deterministic recommendation hint to dual-solve results so cli, browser, and desktop clients can compare claude and codex before choosing a winner.

changes:

• capture the text returned by each engine during run_candidate
• include log and top-level recommendation in vouch dual-solve --json
• include log and recommendation in review-ui job and choose responses
• render recommendation and collapsible engine logs in the browser dual-solve ui
• cover log capture, recommendation behavior, cli json, and web payloads in tests

verified:

• /home/a/Dev/plind-junior/vouch/.venv/bin/python -m pytest tests/test_dual_solve.py tests/test_web_dual_solve.py -q
• /home/a/Dev/plind-junior/vouch/.venv/bin/python -m ruff check src/vouch/dual_solve.py src/vouch/cli.py src/vouch/web/dual_solve_api.py tests/test_dual_solve.py tests/test_web_dual_solve.py
• /home/a/Dev/plind-junior/vouch/.venv/bin/python -m mypy src

[coderabbitai]

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• Commit unit tests in branch feat/dual-solve-engine-logs

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