feat: add cli backend invocation specs

crates/localllm-cli/src/main.rs

@@ -614,15 +614,40 @@ fn preview_effect(action: &str, detail: Option<&str>) -> String {
 }
 
 fn backend_invocation(cli: &Cli) -> BackendInvocation {
-    let preview = execution_preview(
-        cli,
-        &execution_stub(&execution_contract(&plan_command(cli))),
-    );
-
-    match preview {
-        ExecutionPreview::SummaryOnly { command } => BackendInvocation::SummaryOnly { command },
+    match &cli.command {
+        Commands::Status => BackendInvocation::HttpCall {
+            method: "GET",
+            url: format!("{}/health", cli.server.trim_end_matches('/')),
+            api_key_present: cli.api_key.is_some(),
+            body: None,
+        },
+        Commands::Models(models) => match &models.command {
+            ModelsSubcommand::List => BackendInvocation::HttpCall {
+                method: "GET",
+                url: format!("{}/v1/models", cli.server.trim_end_matches('/')),
+                api_key_present: cli.api_key.is_some(),
+                body: None,
+            },
+            _ => BackendInvocation::SummaryOnly {
+                command: command_summary(&cli.command),
+            },
+        },
+        Commands::Bench(bench) => match &bench.command {
+            BenchSubcommand::Throughput(args) => BackendInvocation::HttpCall {
+                method: "POST",
+                url: format!("{}/v1/chat/completions", cli.server.trim_end_matches('/')),
+                api_key_present: cli.api_key.is_some(),
+                body: Some(format!(
+                    "model={} samples={} prompt_tokens={} completion_tokens={} stream=false",
+                    args.model, args.samples, args.prompt_tokens, args.completion_tokens
+                )),
+            },
+            _ => BackendInvocation::SummaryOnly {
+                command: command_summary(&cli.command),
+            },
+        },
         _ => BackendInvocation::SummaryOnly {
-            command: "backend-unimplemented".to_owned(),
+            command: command_summary(&cli.command),
         },
     }
 }