[deep-report] Install Go toolchain in Daily CLI Performance Agent workflow

[github-actions]

Description

The Daily CLI Performance Agent reports a missing_tool because the Go toolchain is not installed when it tries to run benchmark-related commands. Add an actions/setup-go@v5 step (and any required make deps) so the workflow can run benchmarks without emitting missing_tool.

Expected Impact

Eliminates missing_tool reports and ensures CLI performance metrics are collected consistently.

Suggested Agent

CI/Workflow agent

Estimated Effort

Fast (< 30 min)

Data Source

DeepReport Intelligence Briefing - 2026-01-21 (discussion #10920)

AI generated by DeepReport - Intelligence Gathering Agent

[github-actions]

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