chore: simplify, modernize (Go 1.26), update deps

[rustatian]

Applied

Lens	Location	Change
S	handler.go:37	Collapse two io.WriteString+HasSuffix calls into a single write; drop unused strings import
M	format_handler.go:211	Replace append([]T(nil), ...) idiom with slices.Clone for preAttrs and groups in clone()

Deps

go get -u all && go mod tidy in root and tests/; go work sync.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

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Run ID: 65508cc7-9ebd-4055-8181-4f9a0f9b6886

📥 Commits

Reviewing files that changed from the base of the PR and between e2fd79d and 7df907f.

⛔ Files ignored due to path filters (1)

• tests/go.sum is excluded by !**/*.sum

📒 Files selected for processing (2)

• format_handler.go
• handler.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/cleanup-modernize-deps

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[Copilot]

Pull request overview

This PR modernizes the module/toolchain and dependencies while making small simplifications in the logging handlers.

Changes:

• Updated module/workspace to Go 1.26 toolchain and refreshed dependencies (go mod tidy / go work sync).
• Simplified RawHandler.Handle to ensure newline termination with a single write and removed an unused import.
• Replaced manual slice-copy idioms with slices.Clone in FormatHandler.clone().

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tests/go.sum	Records updated dependency checksums after dependency refresh.
handler.go	Simplifies raw handler message writing and removes unused strings import.
format_handler.go	Uses slices.Clone for clearer slice copying in handler cloning.

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