tunnel log callback

[kcoopermiller]

Description

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• New tests have been added to cover the changes

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

---

Note

Low Risk
Low risk: changes are limited to logging/observability around tunnel lifecycle plus a patch-level dependency bump, with no functional changes to sandbox execution flow.

Overview
Improves Prime Tunnel observability in CliAgentEnv.get_tunnel_url() by wiring a log_callback (emitting tunnel output to debug logs) and including recent frpc output when server-side registration expires and the tunnel is recreated.

Bumps the prime-tunnel dependency from 0.1.6 to 0.1.7 to support the new callback behavior.

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