chore(go.mod): remove ineffective replace directives

[aofei]

As a library, spx's replace directives have no effect when imported by other Go programs, because spx is not the main module in that context.

As documented in https://go.dev/ref/mod#go-mod-file-replace:

replace directives only apply in the main module's go.mod file and
are ignored in other modules.

[gemini-code-assist]

Summary of Changes

Hello @aofei, 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 streamlines the Go module configuration by removing replace directives from the go.mod files. These directives are explicitly stated by Go documentation to be ineffective for libraries when they are consumed by other modules, as they only apply to the main module's go.mod file. The change eliminates redundant and non-functional configurations, leading to a cleaner and more accurate representation of the project's dependency graph.

Highlights

• Dependency Management Cleanup: Removed ineffective replace directives from the main go.mod file, as these directives are ignored when the module is used as a library.
• Codegen Module Cleanup: Removed identical ineffective replace directives from the pkg/gdspx/cmd/codegen/go.mod file.
• Checksums Update: Updated the go.sum file to reflect the correct module checksums and versions after the removal of the replace directives, ensuring consistency with actual dependencies.

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[gemini-code-assist]

Code Review

This pull request correctly removes ineffective replace directives from the go.mod files. For a library project, these directives are ignored when the library is used as a dependency, so removing them makes the development environment better reflect how consumers will use the package. This change improves dependency management and helps prevent discrepancies between developer and consumer environments. The corresponding updates to go.sum are expected and correct. Overall, this is a good maintenance change.

[Copilot]

Pull request overview

This PR removes ineffective replace directives from go.mod files in the spx library. As documented in the Go modules reference, replace directives only apply in the main module's go.mod file and are ignored when spx is imported as a dependency by other Go programs.

Changes:

• Removed replace directives from the root go.mod file
• Removed replace directives from pkg/gdspx/cmd/codegen/go.mod
• Updated go.sum to reflect natural dependency resolution without replace overrides

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
go.mod	Removed 4 replace directives for golang.org/x/* packages
pkg/gdspx/cmd/codegen/go.mod	Removed 4 replace directives for golang.org/x/* packages
go.sum	Updated checksums to reflect natural dependency versions (golang.org/x/image v0.23.0, golang.org/x/mobile v0.0.0-20220518205345-8578da9835fd, and various transitive dependencies)

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[xgopilot]

Code Review Summary

The PR correctly removes ineffective replace directives from library modules. All automated checks pass and the changes align with Go module best practices.

One area for consideration:

cmd/igox/go.mod:36-37 still contains replace directives pinning to the same old versions:

golang.org/x/image => golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d
golang.org/x/mobile => golang.org/x/mobile v0.0.0-20210902104108-5d9a33257ab5

While these are effective in a main module, they create version inconsistency with the rest of the codebase (which now uses newer versions). Consider updating cmd/igox/go.mod for consistency unless there's a specific reason igox requires these older versions.