Update CONTRIBUTING.md

[SickleFire]

add send pull requests to dev branch

Pull Request Title

Description

What changed and why. Link to any relevant issue(s) with # (e.g., Fixes #12).

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Chore / Refactor

Related issues

• Issue: # (link issue number)
• Related PRs: (if any)

How Has This Been Tested

Describe the tests you ran to verify your changes. Provide instructions so reviewers can reproduce:

• Unit tests: cargo test --lib
• Integration tests: cargo test --test <name>
• Manual steps: list commands and expected output
• Platform tested on: e.g., Windows 10, Ubuntu 22.04

Checklist

• I have read the CONTRIBUTING.md and followed the repo guidelines.
• Code builds locally (cargo build --release)
• All tests pass (cargo test)
• New and existing tests cover my changes
• I added/updated documentation where applicable
• I updated CHANGELOG or release notes if needed

CI and Performance Notes

• CI status: mention if CI is expected to fail or needs special env vars
• Performance impact: note any runtime or memory implications

Screenshots or Logs

If applicable, include screenshots, logs, or sample output.

Release Notes

• Release type: major/minor/patch
• Notes for release manager: short summary for changelog