Add standard license reference texts and adoption guidance

docs/oss/licenses/README.md

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+# Standard License Reference Texts
+
+This collection supplies reusable reference texts for repositories adopting the
+[Open Source Licensing And Attribution Policy](../../policy/oss.md). Copy the
+texts your dependencies use into your repository's `docs/oss/licenses/`, together
+with applicable companion texts. The collection is not exhaustive, and adopting
+projects need not copy every file.
+
+These files are reference material. Their presence does not license this
+repository or an adopting project under every listed license.
+
+## Sources
+
+The texts were retrieved on 2026-09-26 and are preserved byte-for-byte from the
+sources below. GNU and Apache texts come directly from their publishers. MIT and
+BSD texts come from the SPDX License List data at commit
+`31ba1a50e5397e00a304dbadc76531740e89ee48`.
+
+| Local text | Source |
+| --- | --- |
+| [GPL-2.0.txt](GPL-2.0.txt) | [Free Software Foundation](https://www.gnu.org/licenses/old-licenses/gpl-2.0.txt) |
+| [GPL-3.0.txt](GPL-3.0.txt) | [Free Software Foundation](https://www.gnu.org/licenses/gpl-3.0.txt) |
+| [LGPL-2.0.txt](LGPL-2.0.txt) | [Free Software Foundation](https://www.gnu.org/licenses/old-licenses/lgpl-2.0.txt) |
+| [LGPL-2.1.txt](LGPL-2.1.txt) | [Free Software Foundation](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt) |
+| [LGPL-3.0.txt](LGPL-3.0.txt) | [Free Software Foundation](https://www.gnu.org/licenses/lgpl-3.0.txt) |
+| [BSD-2-Clause.txt](BSD-2-Clause.txt) | [SPDX](https://github.com/spdx/license-list-data/blob/31ba1a50e5397e00a304dbadc76531740e89ee48/text/BSD-2-Clause.txt) |
+| [BSD-3-Clause.txt](BSD-3-Clause.txt) | [SPDX](https://github.com/spdx/license-list-data/blob/31ba1a50e5397e00a304dbadc76531740e89ee48/text/BSD-3-Clause.txt) |
+| [MIT.txt](MIT.txt) | [SPDX](https://github.com/spdx/license-list-data/blob/31ba1a50e5397e00a304dbadc76531740e89ee48/text/MIT.txt) |
+| [Apache-2.0.txt](Apache-2.0.txt) | [Apache Software Foundation](https://www.apache.org/licenses/LICENSE-2.0.txt) |
+
+## Using The Texts
+
+- Keep standard wording, formatting, and generic copyright placeholders intact.
+  Put actual upstream copyright statements in the component's attribution entry.
+  Link project-specific notices and exceptions to the imported upstream commit.
+- GNU filenames identify the text version. The attribution entry's SPDX
+  expression specifies `-only` or `-or-later` according to the upstream grant;
+  a shared text does not select that grant for the component.
+- LGPL 2.0 is the GNU Library General Public License. LGPL 2.1 and 3.0 are the
+  GNU Lesser General Public License; these versions are distinct.
+- When copying LGPL 3.0, also copy GPL 3.0, whose terms it incorporates, and make
+  both texts reachable from the attribution entry. Include other companion texts
+  or exceptions when the component's applicable terms require them.
+
+Record any intentional source refresh here and preserve the retrieved text
+without editorial changes. No synchronization service or recurring release check
+is required for this reference collection.