## Why
`codex-app-server` is published as a standalone release binary, so it
should support the same basic version inspection behavior users expect
from command-line tools. This is independent of package assembly:
package metadata now comes from `codex-rs/Cargo.toml`, but the
standalone app-server binary should still answer `--version` directly.
## What changed
- Enables Clap's generated `--version` flag for the `codex-app-server`
binary by adding `#[command(version)]` to its top-level parser.
## Verification
- Ran `cargo run -p codex-app-server --bin codex-app-server --
--version` and verified it prints `codex-app-server 0.0.0`.
Michael Bolin
1495302347