[Z180] Optimze QFP board layout

[tgtakaoka]

No description provided.

[tgtakaoka-bot]

Self-approved as owner.

[gemini-code-assist]

Summary of Changes

Hello @tgtakaoka, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on optimizing the physical layout of the Z180 QFP board. It involves fine-tuning design rules, such as reducing minimum clearance for zones, and incorporates substantial modifications to the placement and routing of elements, which are reflected across the regenerated manufacturing output files (Gerber and drill files).

Highlights

• Design Rule Adjustment: The minimum clearance for PCB zones has been reduced from 0.3mm to 0.2mm, allowing for tighter component placement and routing.
• Layout Optimization: Significant changes have been made to the board layout, affecting component placement, silkscreen, and drill hole positions, as reflected in the updated Gerber and drill files.
• KiCad Project Configuration: Updates were applied to the KiCad project library configuration, specifically adjusting column widths.

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[gemini-code-assist]

Code Review

This pull request aims to optimize the QFP board layout, which is reflected in the widespread changes across the Gerber and drill files. However, a critical process issue has been identified: the source KiCad PCB layout file (.kicad_pcb) is missing from the pull request. The changes have been made directly to the generated manufacturing files (Gerbers/drills), which makes the review of the layout changes practically impossible and breaks the project's integrity. If the manufacturing files are regenerated from the KiCad project, these optimizations will be lost. Please update the PR to include the modified .kicad_pcb file, which is the source of truth for the design.

[gemini-code-assist]

The changes in this and other Gerber/drill files indicate a modification of the PCB layout. However, the source KiCad PCB file (.kicad_pcb) that these files are generated from has not been included in this pull request.

Committing changes to generated files without updating the source design file is a critical issue for several reasons:

• Loss of Changes: If anyone regenerates the manufacturing files from the KiCad project, all the layout optimizations in this pull request will be overwritten and lost.
• Source of Truth: The KiCad project files are the source of truth for the design. The repository will become inconsistent, with manufacturing files not matching the source design.
• Unreviewable Changes: It is extremely difficult and error-prone to review layout changes by inspecting Gerber file coordinates. The changes should be reviewed in the KiCad PCB editor using the diff feature on the .kicad_pcb file.

Please update this pull request to include the modified .kicad_pcb file. The Gerber files should then be regenerated from this updated source file to ensure consistency.