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TestPackageDocs walked into directories starting with "." (such as .claude worktrees) and only logged warnings on duplicate package docs across files in a directory. Skip dot-directories (which covers the old .git but also .claude), ignore files with "//go:build ignore" so command files don't falsely trip the duplicate check, and promote the duplicate-doc warning to a t.Errorf. While here, deduplicate the package docs that were previously only logged: drop the redundant comment from client/systray/startup-creator.go, move the comprehensive taildrop doc into feature/taildrop/doc.go, and remove a leftover doc fragment from feature/condlite/expvar/omit.go. The tstest/integration/vms allowlist is no longer needed since the //go:build ignore filter now handles its dns_tester.go and udp_tester.go files generically. Fixes #19526 Change-Id: Id794d96bd728826a1883a054e4a244f90fa05d3d Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>