feat: 早报系统重构与功能增强

- 新增常驻调度器 daily/scheduler.py + run-scheduler.ps1（定时生成/推送）
- 新增 daily/bridge_manager.py：Windows 兼容的 Cursor SDK 桥接
- 新增 skills/daily-featured-pick 首推 Skill 与叙事轴/去重逻辑
- 新闻抓取窗口、GitHub 搜索、企微 delta 模式等多项改进
- 补充设计文档与 superpowers 计划/规范
- 新增对应测试（scheduler、featured_pick、github_search、news_fetch_window 等）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

daily/llm_client.py

@@ -76,16 +76,9 @@ def _cursor_chat(system: str, user: str) -> str:
         return ""
     from cursor_sdk import Agent, AgentOptions, CursorAgentError, LocalAgentOptions
 
-    from daily.config import ensure_bot_on_path
-
-    ensure_bot_on_path()
-    try:
-        from bridge_manager import warm_cursor_bridge
-    except ImportError:
-        warm_cursor_bridge = lambda: None  # noqa: E731
+    from daily.bridge_manager import warm_cursor_bridge
 
     cwd = env("DAILY_CURSOR_CWD") or str(ROOT)
-    # bridge_manager 读 bot env_config 的 CURSOR_CWD，早报侧须先对齐工作目录
     os.environ["CURSOR_CWD"] = cwd
     warm_cursor_bridge()
     model = env("CURSOR_MODEL") or "composer-2.5"
@@ -115,5 +108,16 @@ def llm_chat(system: str, user: str) -> str:
     return ""
 
 
+def has_cursor_configured() -> bool:
+    return bool((env("CURSOR_API_KEY") or "").strip())
+
+
+def cursor_agent_prompt(system: str, user: str) -> str:
+    """仅 Cursor SDK Agent（可用 WebSearch 等工具），不走 OpenAI 兼容 API。"""
+    if not has_cursor_configured():
+        return ""
+    return _cursor_chat(system, user)
+
+
 def has_llm_configured() -> bool:
     return bool(env("DAILY_LLM_API_KEY") or env("OPENAI_API_KEY") or env("CURSOR_API_KEY"))