• Inventory of the unpacked tree (excluding .pc/): main.go, version/asm.go, version/exe.go, version/read.go, LICENSE, README.md, go.mod, and debian/*. No binary, minified, archived or generated file, no vendor/ and no test data anywhere; the only non-text files beside the tree are the .dsc and the two tarballs.
• LICENSE is the Go project's BSD-3-clause text ('Copyright (c) 2009 The Go Authors. All rights reserved.'), and every source file carries // Copyright 2017 The Go Authors. All Rights Reserved. plus 'Use of this source code is governed by a BSD-style license ... in the LICENSE file'. debian/copyright Files: * names The Go Authors and BSD-3-clause and carries the complete licence text, so the notice is reproduced.
• A grep of the whole tree (gitignore off) for Copyright/(C)/©/SPDX/Licensed under/permission is hereby granted/GNU/Apache/Mozilla/public domain/all rights reserved/non-commercial/no-modification found only the Go Authors notices above: no second holder, no other licence, no non-free clause. This also covers README.md and go.mod, which have no notice of their own.
• debian/copyright input to the scan: the pre-scan's author check reported 'every holder found is named in debian/copyright' and listed no files to account for, so there is nothing from that list to explain as an issue.
• The debian/copyright stand-alone BSD-3-clause paragraph paraphrases clause 3 as 'Neither the name of the developer(s) ...' where the upstream LICENSE names 'Google Inc.'. The licence is the same BSD-3-clause and the holder is named in Copyright, so this is a wording difference only, not a licensing inaccuracy.
• Debian patch 0001-import-own-version-package.patch only changes main.go: it drops the // import "rsc.io/goversion" comment and imports github.com/kastenhq/goversion/version instead of rsc.io/goversion/version. version/*.go import only the standard library (encoding/binary, fmt, os, debug/elf, debug/macho, debug/pe, io, regexp, archive/... ), so the tree builds without anything outside itself; the patch's claim is accurate.
• go.mod still has require rsc.io/goversion v1.2.0 // indirect, which the patch makes unused, but dh-golang compiles in GOPATH mode (GO111MODULE defaults to off in /usr/share/perl5/Debian/Debhelper/Buildsystem/golang.pm), so the stale require does not affect the build or the shipped -dev package.
• Build-Depends checked against the archive: debhelper-compat (= 14) (debhelper 14.5), dpkg-build-api (= 1) (virtual package provided by dpkg-dev 1.23.11; level 1 is 'the recommended level' per dpkg-build-api(7), and it makes Rules-Requires-Root default to no), dh-go 1.69 (provides the golang debhelper addon and dh_golang_autopkgtest, Conflicts dh-golang), golang-any 2:1.27~1. All exist, and dpkg-build-api level 1 matches the current dpkg.
• Testsuite: autopkgtest-pkg-go is the documented mechanism: autodep8(1) 'AUTOMATIC USAGE BY AUTOPKGTEST' says autopkgtest calls autodep8 for Testsuite: autopkgtest-pkg-TYPE. autodep8 0.31's changelog records 'go: drop explicit test dependency on dh-golang (Closes: #1147597)', so the generated go test works with this package's dh-go, and no debian/tests/control is needed.
• Built-Using/Static-Built-Using: /usr/bin/dh_golang writes misc:Static-Built-Using (and the deprecated misc:Built-Using for compatibility, and only for arch-dependent packages), so the two ${misc:...} fields on the goversion binary are the right ones and an empty value is dropped by dh_gencontrol.
• Multi-Arch: foreign on both packages is correct: the -dev package ships architecture-independent Go source, and Policy 5.6.34.2 states that for binary executables 'the exposed interface can be independent of the architecture used to execute' - goversion's interface (reporting the Go build version of an executable) does not expose the architecture; cmake is a precedent for foreign on an architecture-dependent tool.
• Standards-Version 4.7.4 against the reviewing system's Policy 4.7.4.1: same first three components, so not an issue. Changelog 1.1-1, unstable, initial release closing #1148627, matches the upstream 1.1 tarball. No missing Priority field (Policy 2.5 allows omission of optional since dpkg 1.22.13).
• The lintian override in debian/source/lintian-overrides (missing-build-dependency-for-dh-addon golang) is justified: apt-cache shows dh-go 1.69 has no Provides: dh-sequence-golang and Conflicts: dh-golang, while debian/rules loads the addon with --with=golang.
• uscan found the packaged version as the newest upstream release (upstream 1.1, packaged 1.1).

• Whether the fork's own additions (version.ReadExeFromReader, which is in the orig tarball and not touched by the Debian patch) were written by Kasten and are held by a copyright holder of their own: no file notice names anyone but The Go Authors, debian/copyright states Kasten added no statement of its own, and the archive gives no way to look behind the repository.
• A build and autopkgtest run were not attempted (and cannot be here); nothing in the tree - no missing file named by debian/rules, no dependency absent from the archive - suggests either would fail.

None.