feat(core,cli,server,web): add goal mode — loop Tasks on one Session until an objective completes (#66)

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

packages/core/test/markers.test.ts

@@ -29,6 +29,7 @@ import {
   parseSkillsMessage,
   parseUserSteeringText,
   startsWithMarker,
+  stripConversationMarkers,
   stripMarkerBlocks,
   transcribeToolCall,
   transcribeUserInput,
@@ -68,10 +69,48 @@ describe("marker block primitives", () => {
       MARKER_TAGS.handoffFrom,
       MARKER_TAGS.scheduledTask,
       MARKER_TAGS.modelSwitchFrom,
+      MARKER_TAGS.goal,
     ]);
   });
 });
 
+describe("stripConversationMarkers (whole-message title cleaning)", () => {
+  it("removes machine marker blocks, keeps the human body", () => {
+    // The skill-invocation block that wraps a first user message must not reach the title.
+    expect(
+      stripConversationMarkers(
+        "[use_skills]\nskills: penguin-sdk, web-design\n[/use_skills]\n做一个 RAG 应用",
+      ),
+    ).toBe("做一个 RAG 应用");
+    // Handoff and scheduled-task markers are stripped too; ordinary bracketed text stays.
+    expect(stripConversationMarkers("[handoff_from]data_analyst[/handoff_from]继续分析")).toBe(
+      "继续分析",
+    );
+    // The /model switch origin block (the new session's first message) must not leak into the title either.
+    expect(
+      stripConversationMarkers(
+        "[model_switch_from]\nsession: session-01\ntrace: /t/x_001.jsonl\n[/model_switch_from]\n继续这个任务",
+      ),
+    ).toBe("继续这个任务");
+    expect(stripConversationMarkers("render a <div> element")).toBe("render a <div> element");
+    expect(stripConversationMarkers("check the [config] section")).toBe(
+      "check the [config] section",
+    );
+  });
+
+  it("the old angle-bracket marker form is still stripped (material from old Traces)", () => {
+    expect(
+      stripConversationMarkers("<use_skills>\nskills: web-design\n</use_skills>\n做一个落地页"),
+    ).toBe("做一个落地页");
+    expect(stripConversationMarkers("<handoff_from>data_analyst</handoff_from>继续分析")).toBe(
+      "继续分析",
+    );
+    expect(
+      stripConversationMarkers("<model_switch_from>session: s1</model_switch_from>继续这个任务"),
+    ).toBe("继续这个任务");
+  });
+});
+
 describe("engine blocks ([turn_aborted] / [turn_retried] / [context_summary] / [summary])", () => {
   it("wraps a compaction summary as the new context's first input", () => {
     expect(buildContextSummaryText("the gist")).toBe(