docs: fix workspace package count and Python version in CONTRIBUTING.md

[Iliamgeladze1998]

Summary

Fixes two documentation discrepancies in .github/CONTRIBUTING.md:

1. Incorrect workspace package count (#6664)

The CONTRIBUTING.md stated "four packages under lib/" and listed only 4 packages in the table, but pyproject.toml defines 6 workspace members:

[tool.uv.workspace]
members = [
    "lib/crewai",
    "lib/crewai-tools",
    "lib/devtools",
    "lib/crewai-files",
    "lib/cli",
    "lib/crewai-core",
]

Fix: Updated count from "four" to "six" and added the missing crewai-core and cli packages to the table.

2. Python version discrepancy (#6662)

Three different Python versions were referenced:

• .python-version: 3.13
• .github/workflows/publish.yml: 3.12
• .github/CONTRIBUTING.md: "development targets 3.12"
• pyproject.toml: >=3.10,<3.14

Fix: Updated CONTRIBUTING.md to say "3.10–3.13 (development targets 3.13)" to match the .python-version file and the upper bound in pyproject.toml.

Testing

Documentation-only change, no code affected.

Fixes #6664
Fixes #6662

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📥 Commits

Reviewing files that changed from the base of the PR and between b066d4a and ce43068.

📒 Files selected for processing (1)

• .github/CONTRIBUTING.md

🚧 Files skipped from review as they are similar to previous changes (1)

• .github/CONTRIBUTING.md

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📝 Walkthrough

Walkthrough

The contribution guide updates its Python support and development target versions, and expands the uv workspace package table from four to six packages.

Changes

Contribution guide alignment

Layer / File(s)	Summary
Update development and workspace references .github/CONTRIBUTING.md	The prerequisites now specify Python 3.10–3.13 with 3.13 as the development target, and the repository structure lists six lib/ workspace packages including crewai-core and cli.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the documentation-only fixes to CONTRIBUTING.md for workspace count and Python version guidance.
Description check	✅ Passed	The description is directly related to the same documentation corrections made in the pull request.
Linked Issues check	✅ Passed	The changes address both linked issues by updating the workspace package count and aligning Python version guidance.
Out of Scope Changes check	✅ Passed	No unrelated changes are present; the diff stays within the documented CONTRIBUTING.md corrections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

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• Create PR with unit tests

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[Iliamgeladze1998]

Note: Per the CONTRIBUTING.md, this PR was authored with AI assistance. I was unable to add the llm-generated label due to OAuth App access restrictions on the crewAIInc organization. Could a maintainer please add it?