refactor: remove CLI shim from crewai package

The backward-compat shim is unnecessary — nothing imports from
crewai.cli.cli and the entry point lives in crewai-cli now.

lib/crewai/src/crewai/cli/cli.py

@@ -1,31 +0,0 @@
-"""Backward-compatibility shim.
-
-The CLI has moved to the ``crewai-cli`` package.  This module re-exports the
-Click group so that ``python -m crewai.cli.cli`` or direct imports continue to
-work when both packages are installed.
-"""
-
-from __future__ import annotations
-
-
-try:
-    from crewai_cli.cli import crewai
-except ImportError:
-    import click
-
-    @click.group()
-    def crewai() -> None:
-        """Top-level command group for crewai."""
-
-    @crewai.command()
-    def _missing() -> None:
-        click.secho(
-            "The crewai CLI has moved to the crewai-cli package.\n"
-            "Install it with: pip install crewai-cli   (or pip install crewai[cli])",
-            fg="red",
-        )
-        raise SystemExit(1)
-
-
-if __name__ == "__main__":
-    crewai()