[GreyDGL]

Depends on #495 and #496; merge those first so this PR reduces to the public-page commit.

Summary:

• replace obsolete in-repository XBOW links and commands with a concise historical benchmark note
• state that XBOW artifacts are external and reference-only
• state that the supported CLI, Makefile, CI, and Docker runtime do not expose an XBOW runner
• preserve the December 2025 86.5 percent result as historical research evidence, not a current regression guarantee

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 XBOW benchmark runner (run_xbow.py), its associated tests, and historical qualification records, clarifying that the sibling xbow-benchmark repository is a reference-only archive. Additionally, it upgrades the unified-agent dependency from version 0.2.0 to 0.3.0, enabling the cleanup of dynamic attribute checks, conditional test skips, and type casts in the tracing and test suites. No review comments were provided, so there is no feedback to address.

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