feat: render cli dry-run previews

crates/localllm-cli/src/main.rs

@@ -303,7 +303,72 @@ fn main() -> anyhow::Result<()> {
 }
 
 fn render_execution_preview(cli: &Cli) -> String {
-    format!("DRY RUN {}", render_command_summary(cli))
+    let preview = execution_preview(
+        cli,
+        &execution_stub(&execution_contract(&plan_command(cli))),
+    );
+
+    match (cli.format, preview) {
+        (OutputFormat::Text, ExecutionPreview::SummaryOnly { command }) => {
+            format!("DRY RUN {}", command)
+        }
+        (
+            OutputFormat::Text,
+            ExecutionPreview::HttpPreview {
+                method,
+                url,
+                api_key_present,
+                ..
+            },
+        ) => format!(
+            "DRY RUN {} {} api_key_present={}",
+            method, url, api_key_present
+        ),
+        (
+            OutputFormat::Text,
+            ExecutionPreview::LocalPreview {
+                action,
+                target,
+                effect,
+            },
+        ) => format!("DRY RUN {} target={} effect={}", action, target, effect),
+        (OutputFormat::Json, ExecutionPreview::SummaryOnly { command }) => {
+            format!(r#"{{"kind":"summary","command":"{}"}}"#, command)
+        }
+        (
+            OutputFormat::Json,
+            ExecutionPreview::HttpPreview {
+                method,
+                url,
+                api_key_present,
+                body,
+            },
+        ) => format!(
+            r#"{{"kind":"http","method":"{}","url":"{}","api_key_present":{},"body":{}}}"#,
+            method,
+            url,
+            api_key_present,
+            render_json_body(body.as_deref())
+        ),
+        (
+            OutputFormat::Json,
+            ExecutionPreview::LocalPreview {
+                action,
+                target,
+                effect,
+            },
+        ) => format!(
+            r#"{{"kind":"local","action":"{}","target":"{}","effect":"{}"}}"#,
+            action, target, effect
+        ),
+    }
+}
+
+fn render_json_body(body: Option<&str>) -> String {
+    match body {
+        Some(body) => format!(r#""{}""#, body),
+        None => "null".to_owned(),
+    }
 }
 
 fn render_command_summary(cli: &Cli) -> String {