Track live callers of SocketPath::into_inner or remove the method

[coderabbitai]

Background

SocketPath::into_inner in src/engine/connection/mod.rs carries #[expect(dead_code, reason = "public API for completeness; callers may need owned String")] but has no tracked callers. The project's custom lint-integrity check requires all #[expect] attributes to reference a tracking issue.

Required action

Either:

• Add at least one call site in the codebase and remove the #[expect], or
• Confirm the method is aspirational surface and retain the attribute with a link to this issue.

References

• PR Repository cloning (4.2.1) #80 (repository cloning — 4.2.1): Repository cloning (4.2.1) #80