feat: create dedicated CI/CD testing branch with safe-manual workflow

[semitechen]

Description

Describe the changes made in this PR. Include motivation and context.

Linked Issues

Closes # (issue number)

Type of Change

• Hardware Fix (PCB/Schematic)
• Hardware Improvement / New Feature
• Firmware/Software Bug Fix
• Firmware/Software New Feature
• Documentation Update

Checklist

Hardware Review

• DRC/ERC Passed: All Design Rule Checks and Electrical Rule Checks are green.
• 3D Models: All new components have correct 3D footprints.
• BOM Updated: Bill of Materials is updated and parts are available.
• Manufacturing Files: Gerbers/NC Drill files generated and verified in a viewer.

Software Review

• Compiles: Code builds without errors or significant warnings.
• Tests: Unit tests/Integration tests passed (if applicable).
• Formatting: Code follows the project's style guidelines (e.g., clang-format).
• Documentation: New code is documented.

Screenshots / Attachments

Add any relevant screenshots (3D PCB view, scope captures, logic analyzer logs).