ci(workflows): make Knip and Jest workflows reusable (#13)

[Rodrigoue9]

Summary

Resolves #13 by converting the knip.yml and jest-testing.yml workflows into reusable GitHub Actions workflows (workflow_call) supporting parameterized package managers (bun vs yarn) and versions.

Changes

• Added workflow_call triggers to .github/workflows/knip.yml with inputs for package-manager, bun-version, and node-version.
• Added workflow_call triggers to .github/workflows/jest-testing.yml with conditional toolchain setup for both Bun and Yarn.
• Preserved direct pull_request and workflow_dispatch execution.

Closes #13

[coderabbitai]

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Run ID: 762de499-3b7c-4e88-b381-fd1316266037

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