Make .golangci.yml directly runnable with golangci-lint v2

[ametel01]

Summary

• Remove the obsolete gosimple linter entry from .golangci.yml (merged into staticcheck in golangci-lint v2).
• Delete hack/run-golangci-lint.sh wrapper that existed solely to work around this.
• Update Makefile to call golangci-lint run directly.

Test plan

• golangci-lint run works directly from the repo root without the wrapper
• make verify passes (fmt, vet, lint, test, build, vulncheck)

Closes #7

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 014ff2c4-ae5a-4088-9cb7-08dbbd1d849a

📥 Commits

Reviewing files that changed from the base of the PR and between 581aaab and f90fed6.

📒 Files selected for processing (4)

• .golangci.yml
• CHANGELOG.md
• Makefile
• hack/run-golangci-lint.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/7-golangci-yml-directly-runnable

📝 Coding Plan

• Generate coding plan for human review comments

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