feat: update lancedb version and add lance-namespace packages

* chore(deps): update lancedb version and add lance-namespace packages

- Updated lancedb dependency version from 0.4.0 to 0.29.2 in multiple files.
- Added new packages: lance-namespace and lance-namespace-urllib3-client with version 0.5.2, including their dependencies and installation details.
- Enhanced MemoryTUI to display a limit on entries and improved the LanceDBStorage class with automatic background compaction and index creation for better performance.

* linter

* refactor: update memory recall limit and formatting in Agent class

- Reduced the memory recall limit from 10 to 5 in multiple locations within the Agent class.
- Updated the memory formatting to use a new `format` method in the MemoryMatch class for improved readability and metadata inclusion.

* refactor: enhance memory handling with read-only support

- Updated memory-related classes and methods to support read-only functionality, allowing for silent no-ops when attempting to remember data in read-only mode.
- Modified the LiteAgent and CrewAgentExecutorMixin classes to check for read-only status before saving memories.
- Adjusted MemorySlice and Memory classes to reflect changes in behavior when read-only is enabled.
- Updated tests to verify that memory operations behave correctly under read-only conditions.

* test: set mock memory to read-write in unit tests

- Updated unit tests in test_unified_memory.py to set mock_memory._read_only to False, ensuring that memory operations can be tested in a writable state.

* fix test

* fix: preserve falsy metadata values and fix remember() return type

---------

Co-authored-by: lorenzejay <lorenzejaytech@gmail.com>
Co-authored-by: Greyson LaLonde <greyson@crewai.com>

lib/crewai/tests/agents/test_lite_agent.py

@@ -1136,6 +1136,7 @@ def test_lite_agent_memory_instance_recall_and_save_called():
         successful_requests=1,
     )
     mock_memory = Mock()
+    mock_memory._read_only = False
     mock_memory.recall.return_value = []
     mock_memory.extract_memories.return_value = ["Fact one.", "Fact two."]
 

lib/crewai/tests/memory/test_unified_memory.py

@@ -218,14 +218,15 @@ def test_memory_slice_recall(tmp_path: Path, mock_embedder: MagicMock) -> None:
     assert isinstance(matches, list)
 
 
-def test_memory_slice_remember_raises_when_read_only(tmp_path: Path, mock_embedder: MagicMock) -> None:
+def test_memory_slice_remember_is_noop_when_read_only(tmp_path: Path, mock_embedder: MagicMock) -> None:
     from crewai.memory.unified_memory import Memory
     from crewai.memory.memory_scope import MemorySlice
 
     mem = Memory(storage=str(tmp_path / "db7"), llm=MagicMock(), embedder=mock_embedder)
     sl = MemorySlice(mem, ["/a"], read_only=True)
-    with pytest.raises(PermissionError):
-        sl.remember("x", scope="/a")
+    result = sl.remember("x", scope="/a")
+    assert result is None
+    assert mem.list_records() == []
 
 
 # --- Flow memory ---
@@ -318,6 +319,7 @@ def test_executor_save_to_memory_calls_extract_then_remember_per_item() -> None:
     from crewai.agents.parser import AgentFinish
 
     mock_memory = MagicMock()
+    mock_memory._read_only = False
     mock_memory.extract_memories.return_value = ["Fact A.", "Fact B."]
 
     mock_agent = MagicMock()
@@ -358,6 +360,7 @@ def test_executor_save_to_memory_skips_delegation_output() -> None:
     from crewai.utilities.string_utils import sanitize_tool_name
 
     mock_memory = MagicMock()
+    mock_memory._read_only = False
     mock_agent = MagicMock()
     mock_agent.memory = mock_memory
     mock_agent._logger = MagicMock()