When BaseTool.run() was called with no keyword arguments (empty dict),
_validate_kwargs skipped validation because 'if kwargs' is False for {}.
This meant required schema fields like 'queries' in RecallMemoryTool were
never checked, causing a confusing TypeError:
'_run() missing 1 required positional argument: queries'
Fix: Remove the 'kwargs' truthiness check so validation always runs when
an args_schema with fields is present. Skip validation only when positional
args are provided (backwards compat for tool.run('value') style calls).
Also adds dedicated test coverage for RecallMemoryTool and RememberTool.
Co-Authored-By: João <joao@crewai.com>
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