fix(ssh-console): fall back for Lenovo SOL activation

[williampnvidia]

Summary

• keep the existing Lenovo SOL activation command as the primary path
• detect the SR650 v4 Lenovo extraneous arguments response and fall back to console kill / console start
• add focused unit tests for the Lenovo fallback decision and existing non-Lenovo activation behavior

Fixes #2919

Test plan

• cargo +nightly-2026-06-16 fmt --all -- --check
• git diff --check fork/main..HEAD
• cargo test -p carbide-ssh-console --lib lenovo_primary_failure
• cargo test -p carbide-ssh-console --lib non_lenovo_activation
• cargo test -p carbide-ssh-console --lib

Note: William ran the cargo tests on Linux. Local macOS test execution is blocked by existing Linux-specific io_util.rs termios compile errors.

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