refactor(command): remove the relative PATH workaround

[RSS1102]

Summary

• update which to 8.0.6, which includes relative PATH resolution against the provided cwd
• remove the Vite+ relative PATH workaround and delegate binary lookup directly to which::which_in
• retain behavior-level coverage for relative entries, lookup order, Unix edge cases, explicit relative programs, and the cross-platform CLI snapshot

Closes #2482

Testing

• cargo test -p vp_command
• cargo test -p vp_cli_snapshots -- command_exec_relative_path_cwd
• cargo fmt --all -- --check
• cargo check --workspace --all-features --all-targets --locked
• workspace Clippy with the repository flags and --deny warnings
• cargo test --manifest-path crates/vp_trampoline/Cargo.toml
• pnpm build

The CLI snapshot was verified locally on macOS. The existing Windows PTY snapshot CI job will run the same command_exec_relative_path_cwd fixture on a Windows runner.

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	cargo/​which@​8.0.5 ⏵ 8.0.6

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