[codex] add starter pack onboarding command

[aditya-vithaldas]

Summary

• Add crewai starter as a friendly onboarding wrapper around external template repositories.
• Add starter-pack terminology to the remote template installer while preserving crewai template behavior.
• Document starter packs as pulled-in, job-focused templates and add CLI coverage.

Closes #6301

Design notes

Starter packs intentionally stay outside the CrewAI core runtime. The new command delegates to the existing remote template mechanism, so packs such as analyst resolve to external template_* repositories and install as ordinary CrewAI projects.

Validation

• uv run pytest lib/cli/tests/test_cli.py -k starter
• uv run pytest lib/cli/tests/test_cli.py
• uv run ruff check lib/cli/src/crewai_cli/cli.py lib/cli/src/crewai_cli/remote_template/main.py lib/cli/tests/test_cli.py
• uv run ruff format --check lib/cli/src/crewai_cli/cli.py lib/cli/src/crewai_cli/remote_template/main.py lib/cli/tests/test_cli.py
• python3 -m json.tool docs/docs.json >/tmp/docs-json-check.json
• uv run crewai starter --help

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[corridor-security]

Summary: This PR adds a CLI onboarding wrapper for starter packs that delegates to the existing remote template installation flow and updates documentation/tests. No exploitable security vulnerabilities were identified in the added code.

Risk: Low risk. The change does not introduce new authentication, authorization, server-side data handling, or public network endpoints beyond the existing template download mechanism.