feat: add package manager command runner

[exKAZUu]

Summary

• Add a reusable helper that copies a submission into a temporary project directory, overlays package-manager project files from the problem directory, runs a command with stdin and timeout handling, and cleans up afterward.
• Support JavaScript package managers, uv-based Python projects, Maven, Gradle, Ruby/Bundler, Rust/Cargo, and Go module project files by default.
• Harden package-manager execution with output limits, timeout escalation, POSIX process-group termination, optional GNU time based RSS measurement, EPIPE-tolerant stdin handling, merged environment variables, and outputLimitExceeded integration with commandJudgePreset.
• Export both the command runner and the project-file copy helper from the package root.

Testing

• yarn verify
• bunx @willbooster/agent-skills@1.28.0 review --agent all
• bunx @willbooster/agent-skills@1.28.0 check-pr-ci

[gemini-code-assist]

Code Review

This pull request introduces a new helper function, runCommandInTemporaryPackageManagerProject, which facilitates running commands within a temporary project environment for various package managers. The review identified several critical improvements: implementing a buffer size limit for stdout and stderr to prevent memory exhaustion, adjusting the execution time measurement to exclude setup overhead, and merging environment variables instead of replacing them. Additionally, it was recommended to use SIGKILL for more reliable process termination and to ensure that timeouts are cleared when a subprocess error occurs to prevent memory leaks.