完善 MCP/会话上下文治理并补齐搜索与诊断能力。

补充历史压缩与会话诊断链路，强化 tool pairing 与空响应兜底观测；完善 Admin MCP 导入/绑定与相关前端展示；新增 web_search_fast/web_fetch_clean 及多项测试与文档更新，并同步技能安装与角色绑定策略改进。

Made-with: Cursor

tests/test_session_context_diagnostics.py

@@ -0,0 +1,24 @@
+from __future__ import annotations
+
+from oclaw.platform.persistence.sqlite_store import SqliteStore
+from oclaw.runtime.chat.session_context_diagnostics import compute_session_context_stats
+
+
+def test_compute_session_context_stats_detects_empty_assistant(tmp_path) -> None:  # noqa: ANN001
+    db = tmp_path / "ops.sqlite"
+    store = SqliteStore(str(db))
+    sess = store.create_session("t")
+    store.add_message(session_id=sess.id, role="user", content="hi", event_type="user_text")
+    store.add_message(session_id=sess.id, role="assistant", content="", event_type="assistant_text")
+    store.add_message(session_id=sess.id, role="tool", content="x" * 50, event_type="tool_result")
+    store.add_message(session_id=sess.id, role="assistant", content="ok", event_type="assistant_text")
+
+    st = compute_session_context_stats(store=store, session_id=sess.id, sample_n=50, last_n=10)
+    assert st.session_id == sess.id
+    assert st.total_messages >= 4
+    assert st.sampled_messages >= 4
+    assert st.empty_assistant_text_in_sampled == 1
+    assert len(st.empty_assistant_text_ids) == 1
+    assert st.last_n_total_chars >= 52
+    assert st.last_n_max_tool_chars == 50
+