Vouch Request: Security regression tests for issue #1498

[RanPollak]

Hi OpenShell maintainers,

I would like to contribute regression tests for the hostname parser security issue documented in #1498.

What I want to add:
Add 9 unit tests to crates/openshell-sandbox/src/proxy.rs that test the parse_target() function for security vulnerabilities like NUL byte injection, control character injection, and other malformed hostname cases.

Why this matters:
Issue #1498 specifically requests regression coverage for the Claude Code SOCKS5 bypass vulnerability where NUL bytes in hostnames can cause parser differential attacks. The tests I wrote expose 6 real vulnerabilities in the current code that allow attackers to bypass policy checks.

What I have done:

• Forked the repo and tested locally
• All 9 tests compile and run successfully
• 6 tests fail (exposing vulnerabilities as expected)
• 163 existing tests still pass (no regressions)
• Created PR fix(tests): Add hostname parser security regression tests (#1498) #1552 with detailed documentation

Why me:
I have experience with security testing and wanted to contribute something concrete that addresses a real security issue documented in your issue tracker.

The tests are ready to review - they are test-only changes with zero risk to production code.

Thanks for considering my contribution!