refactor: extract CLI into standalone crewai-cli package

lib/cli/README.md

@@ -0,0 +1,26 @@
+# crewai-cli
+
+CLI for CrewAI — scaffold, run, deploy and manage AI agent crews without
+installing the full framework.
+
+## Installation
+
+```bash
+pip install crewai-cli
+```
+
+This pulls in `crewai-core` (shared utilities) but not the `crewai` framework
+itself, so commands that don't need a crew loaded — `crewai version`,
+`crewai login`, `crewai org list`, `crewai config *`, `crewai traces *`,
+`crewai create`, `crewai template *` — work standalone.
+
+Commands that load a user's crew or flow (`crewai run`, `crewai train`,
+`crewai test`, `crewai chat`, `crewai replay`, `crewai reset-memories`,
+`crewai deploy push`, `crewai tool publish`) require `crewai` to be installed
+in the project's environment. They print a clear error if it is missing.
+
+To install both at once:
+
+```bash
+pip install crewai[cli]
+```