fix: update contributing

[SkArchon]

Summary by CodeRabbit

• Documentation
  • Updated contribution guidelines with additional information about development dependencies.

Checklist

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

[coderabbitai]

Walkthrough

Added documentation to CONTRIBUTING.md describing Bun as a non-core dependency used for building and testing TypeScript-based router plugins and integration tests in a new Other Dependencies subsection under Prerequisites.

Changes

Cohort / File(s)	Summary
Documentation Updates CONTRIBUTING.md	Added "Other Dependencies" subsection under Prerequisites documenting Bun as a non-core dependency for TypeScript router plugin development and integration testing.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Pre-merge checks

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'fix: update contributing' is vague and generic. It uses the non-descriptive term 'update contributing' without specifying what was added or changed in the CONTRIBUTING.md file.	Improve the title to be more specific about the actual change, such as 'docs: add Bun as a non-core dependency in CONTRIBUTING.md' or 'docs: document Other Dependencies prerequisites'.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between dde0ec0 and 8e1c98a.

📒 Files selected for processing (1)

• CONTRIBUTING.md (1 hunks)

🔇 Additional comments (1)

CONTRIBUTING.md (1)

21-26: New "Other Dependencies" section is well-structured and documentation link verified.

The section clearly distinguishes between core and non-core requirements, provides an accurate and current documentation link, and explains the specific use case for Bun. The placement and formatting are consistent with the existing document structure. The Bun installation documentation link has been verified as current and accessible as of November 19, 2025.

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_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[StarpTech]

LGTM