chore: update root repo hygiene and add v2 LICENSE

Doug Barrettrequested to merge
db-root-hygiene into master

Context

Minor repository hygiene fixes to clean up the root project configuration, and add the missing LICENSE to the v2 module.

What's in this MR?

  • .gitignore: Expand with standard Go project entries (*.test, *.out, coverage.html, IDE directories, OS artifacts)
  • .editorconfig: Remove duplicate insert_final_newline = true line
  • LICENSE: Update copyright year range from 2022 to 2026
  • v2/LICENSE: Add LICENSE to v2 module so pkg.go.dev and go-licenses detect it as MIT-licensed
Edited by Doug Barrett

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