fix(cli): claw state exits 1 when no worker state file exists

Previously 'claw state' printed an error message but exited 0, making it
impossible for scripts/CI to detect the absence of state without parsing
prose. Now propagates Err() to main() which exits 1 and formats the error
correctly for both text and --output-format json modes.

Text: 'error: no worker state file found at ... — run a worker first'
JSON: {"type":"error","error":"no worker state file found at ..."}

Author: code-yeongyu

rust/crates/rusty-claude-cli/src/main.rs

@@ -1427,16 +1427,16 @@ fn run_worker_state(output_format: CliOutputFormat) -> Result<(), Box<dyn std::e
     let cwd = env::current_dir()?;
     let state_path = cwd.join(".claw").join("worker-state.json");
     if !state_path.exists() {
-        match output_format {
-            CliOutputFormat::Text => {
-                println!("No worker state file found at {}", state_path.display())
-            }
-            CliOutputFormat::Json => println!(
-                "{}",
-                serde_json::json!({"error": "no_state_file", "path": state_path.display().to_string()})
-            ),
-        }
-        return Ok(());
+        // Emit a structured error, then return Err so the process exits 1.
+        // Callers (scripts, CI) need a non-zero exit to detect "no state" without
+        // parsing prose output.
+        // Let the error propagate to main() which will format it correctly
+        // (prose for text mode, JSON envelope for --output-format json).
+        return Err(format!(
+            "no worker state file found at {} — run a worker first",
+            state_path.display()
+        )
+        .into());
     }
     let raw = std::fs::read_to_string(&state_path)?;
     match output_format {