prime sandbox ssh

[kcoopermiller]

Note

Introduces SSH connectivity and TCP port exposure across SDK and CLI, plus a demo.

• SDK (prime_sandboxes): Add protocol to ExposePortRequest; extend ExposedPort with external_port/external_endpoint; new SSHSession model and exports. SandboxClient/AsyncSandboxClient: expose(..., protocol), list_all_exposed_ports(), create_ssh_session(), close_ssh_session().
• CLI (prime sandbox): expose supports --protocol HTTP|TCP with protocol-aware output; list-ports can list for one sandbox or all; new ssh command creates ephemeral SSH sessions, authorizes key via gateway, connects, and cleans up.
• Examples: New sandbox_port_expose_demo.py showing HTTP and TCP exposure with verification.

Backwards compatibility maintained (default protocol HTTP).

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[JannikSt]

Check edge case:

• Start ssh on machine A (your laptop)
• Bootup a VM + authorize
• Try to access same sandbox with ssh frorm

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