Remove the debug-client CLI entrypoint

[jif-oai]

Deletes codex-rs/debug-client/src/main.rs as one step in removing the stale app-server debug client.

This intentionally leaves Cargo workspace and lockfile cleanup for a later follow-up PR.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Restore a Cargo target before deleting main.rs

With this entrypoint removed while codex-rs/Cargo.toml still lists "debug-client" as a workspace member and debug-client/Cargo.toml has no [lib]/[[bin]], the workspace no longer parses: cargo metadata --no-deps --format-version 1 from codex-rs fails with no targets specified in the manifest. This blocks routine workspace commands such as just test -p ... until the package is removed from the workspace or given another target.

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