fix(tests): resolve failing tests on main branch

- Unskip matrix logic by adding missing deps (matrix-nio, nh3, mistune)
- Update matrix tests for 'allow_from' default deny security change
- Fix asyncio typing keepalive leak in matrix tests
- Update context prompt cache assert after runtime message merge
- Fix flaky cron service test with mtime sleep
- Remove obsolete test_cron_commands.py testing deleted CLI commands

tests/test_context_prompt_cache.py

@@ -54,13 +54,12 @@ def test_runtime_context_is_separate_untrusted_user_message(tmp_path) -> None:
     assert messages[0]["role"] == "system"
     assert "## Current Session" not in messages[0]["content"]
 
-    assert messages[-2]["role"] == "user"
-    runtime_content = messages[-2]["content"]
+    assert len(messages) == 2
+    assert messages[-1]["role"] == "user"
+    runtime_content = messages[-1]["content"]
     assert isinstance(runtime_content, str)
     assert ContextBuilder._RUNTIME_CONTEXT_TAG in runtime_content
     assert "Current Time:" in runtime_content
     assert "Channel: cli" in runtime_content
     assert "Chat ID: direct" in runtime_content
-
-    assert messages[-1]["role"] == "user"
-    assert messages[-1]["content"] == "Return exactly: OK"
+    assert "Return exactly: OK" in runtime_content