[codex] Improve crew run missing script error

[aditya-vithaldas]

Summary

Closes #6305.

• Validate that classic crew projects define the run_crew project script before invoking uv.
• Validate that Python flow projects define the kickoff project script before invoking uv.
• Preserve legacy projects that omit [tool.crewai] but still define the expected run_crew script.

Root Cause

crewai run treated any non-JSON, non-flow project as a classic crew project and called uv run run_crew without checking whether the current pyproject.toml actually exposed that script. Running from a parent repository or unrelated Python project therefore surfaced uv's raw spawn failure instead of actionable CrewAI guidance.

Validation

• uv run pytest lib/cli/tests/test_run_crew.py
• uv run pytest lib/crewai/tests/cli/test_run_crew.py
• uv run ruff check lib/cli/src/crewai_cli/run_crew.py lib/cli/tests/test_run_crew.py
• Smoke checked crewai run from the repo root via PYTHONPATH=lib/cli/src:lib/crewai-core/src uv run python -m crewai_cli.cli run and confirmed it now reports the missing project script with directory guidance.

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[corridor-security]

Summary: This PR adds validation that expected pyproject.toml scripts exist before invoking uv for crew and flow runs, reducing accidental execution attempts from unrelated directories. No exploitable security vulnerabilities were identified in the added code.

Risk: Low risk. The changes affect local CLI control flow and error handling, do not introduce new network-facing surfaces, authentication changes, sensitive data handling, or unsafe subprocess argument construction.

[aditya-vithaldas]

Updated after retesting the generated-project repro. The PR now also scans immediate child directories for a runnable CrewAI project and includes a concrete next step when the user is still in the parent folder, e.g.

Found a CrewAI project in `ai_agent_news`. Try:

  cd ai_agent_news
  crewai run

The generated ai_agent_news project itself exposes the expected run_crew console script; the failing case is running from the parent directory.