[-] chore: appease linter

[ajalon1]

RATIONALE

Handle some lints in main.

CHANGES

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Note

Low Risk
Test-only assertion cleanups (switching to require.NoError and simplifying assert.Contains) with no production code changes, so impact is limited to test behavior/strictness.

Overview
Cleans up several tests to satisfy linting and simplify assertions.

Replaces assert.NoError with require.NoError in cmd/root_test.go to fail fast on command execution errors, and simplifies version string checks in internal/version/version_test.go by using assert.Contains directly (removing the extra strings.Contains/assert.True pattern). Minor formatting tweak in internal/tools/prerequisites_test.go to keep the version.Version override/restore clearer.

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