chore(env): add cloud agent development environment config

[theCyberTech]

• Add .cursor/environment.json to make the repo fully usable in Cursor Cloud Agents.
• install is self-contained: bootstraps uv if missing, then runs uv sync --all-groups --all-extras (the documented contributor setup); idempotent on re-run.
• No start/terminals needed — CrewAI is a library + CLI; the offline test suite (recorded cassettes, --block-network) is the dev workflow.
• Validated on the VM and in a fresh Cloud Agent booted from a prebuilt environment build: uv sync (Python 3.13.15, crewai 1.15.16), ruff check lib/ clean, mypy lib/crewai-core/src clean, pytest lib/crewai/tests/test_task.py 67 passed, and an end-to-end Crew.kickoff() with a stub LLM (no external API).

This PR was authored by an AI agent (Cursor). Per .github/CONTRIBUTING.md, the llm-generated label should be applied.

  

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