refactor: extract net tool handlers into named functions

[danbugs]

Summary

• Extracts all 15 inline closures from register_net_tools into named handle_net_* functions
• register_net_tools is now a thin registration function where each closure is a one-liner delegating to the named handler
• Reduces the audit surface: each handler's logic is independently readable and testable
• Pure refactor — no behavior change

Test plan

• cargo test --lib passes (53 tests — same count as before)
• cargo clippy clean
• cargo fmt clean

[Copilot]

Pull request overview

This PR refactors network tool registration by extracting inline net_* handler closures into named functions, making the host networking dispatch logic easier to audit and test without changing behavior.

Changes:

• Adds named handle_net_* functions for all network tool operations.
• Simplifies register_net_tools to register one-line delegating closures.
• Preserves existing socket table, policy, and listen-port handling semantics.

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[github-actions]

Linux Benchmarks

Details

Benchmark suite	Current: 3f34c27	Previous: 2c92788	Ratio
hello_world (median)	20 ms	20 ms	1
pandas (median)	110 ms	110 ms	1
density (per VM)	7 MB	7 MB	1
snapshot (disk)	385 MiB	385 MiB	1

This comment was automatically generated by workflow using github-action-benchmark.

[github-actions]

Windows Benchmarks

Details

Benchmark suite	Current: 3f34c27	Previous: 2c92788	Ratio
hello_world (median)	251 ms	187 ms	1.34
pandas (median)	758 ms	545 ms	1.39
density (per VM)	6 MB	6 MB	1
snapshot (disk)	392 MiB	392 MiB	1

This comment was automatically generated by workflow using github-action-benchmark.