feat: add phase1 task planner flow

tests/planner_test.rs

@@ -0,0 +1,41 @@
+use serde_json::json;
+use sgclaw::agent::planner::{plan_instruction, PlannerError};
+use sgclaw::pipe::Action;
+
+#[test]
+fn planner_converts_baidu_search_instruction_into_three_steps() {
+    let plan = plan_instruction("打开百度搜索天气").unwrap();
+
+    assert_eq!(plan.summary, "已在百度搜索天气");
+    assert_eq!(plan.steps.len(), 3);
+    assert_eq!(plan.steps[0].action, Action::Navigate);
+    assert_eq!(
+        plan.steps[0].params,
+        json!({ "url": "https://www.baidu.com" })
+    );
+    assert_eq!(plan.steps[1].action, Action::Type);
+    assert_eq!(
+        plan.steps[1].params,
+        json!({ "selector": "#kw", "text": "天气", "clear_first": true })
+    );
+    assert_eq!(plan.steps[2].action, Action::Click);
+    assert_eq!(plan.steps[2].params, json!({ "selector": "#su" }));
+}
+
+#[test]
+fn planner_supports_baidu_search_variant_with_conjunction() {
+    let plan = plan_instruction("打开百度并搜索电网调度").unwrap();
+
+    assert_eq!(plan.summary, "已在百度搜索电网调度");
+    assert_eq!(plan.steps[1].params["text"], "电网调度");
+}
+
+#[test]
+fn planner_rejects_unrelated_instruction() {
+    let err = plan_instruction("打开谷歌搜索天气").unwrap_err();
+
+    assert_eq!(
+        err,
+        PlannerError::UnsupportedInstruction("打开谷歌搜索天气".to_string())
+    );
+}