[GreyDGL]

Depends on #495; merge #495 first so this PR reduces to the product-cleanup commit.

Summary:

• remove the in-repository XBOW qualification runner, its tests, and the committed XBEN run artifact
• remove XBOW commands and workaround references from the product Makefile and current internal docs
• mark the sibling xbow-benchmark checkout as reference-only, with no supported CLI, CI, Docker, or runtime integration
• keep historical migration/hardening records intact as historical evidence

Verification:

• make ci
• 118 maintained-runtime tests passed, 1 live test skipped
• 133 root non-Docker tests passed
• Ruff, format, mypy, lock check, and both package builds passed

[gemini-code-assist]

Code Review

This pull request removes the temporary XBOW qualification runner (including its script and tests) and associated historical qualification records, clarifying that the sibling xbow-benchmark repository is for reference only. It also upgrades the unified-agent dependency from 0.2.0 to 0.3.0, updating the pinned git revision in pyproject.toml and uv.lock. This upgrade enables cleanups in trace.py and tests by replacing dynamic getattr fallbacks with direct imports of CommandOutputDelta, CommandStarted, SQLiteRunMonitor, and ToolProgress. No review comments were provided, so there is no feedback to evaluate.

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