zeta2: Build edit prediction prompt and process model output in client (#41870)

Release Notes:

- N/A

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Co-authored-by: Agus Zubiaga <agus@zed.dev>
Co-authored-by: Ben Kunkle <ben@zed.dev>
Co-authored-by: Piotr Osiewicz <24362066+osiewicz@users.noreply.github.com>

crates/acp_thread/Cargo.toml

@@ -56,3 +56,4 @@ rand.workspace = true
 tempfile.workspace = true
 util.workspace = true
 settings.workspace = true
+zlog.workspace = true