License peo4c under GPL-3.0-or-later and ship third-party notices

- Add the GPL-3.0 LICENSE and SPDX headers to peo4c's own files.
- Add THIRD_PARTY_NOTICES.md listing every bundled component, its
  license and where its license text lives in the image, plus a
  trademark disclaimer; reference it from the README.
- Ship neo4j-browser's LICENSE, NOTICE.txt and LICENSES.txt with a
  source archive of the built commit, as the GPL requires.
- Ship Apache AGE's LICENSE and NOTICE, which the base image lacks.
- Collect license texts for Python packages whose wheels omit them,
  from PyPI sdists or vendored copies in docker/licenses/.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

bridge/peo4c/__init__.py

@@ -0,0 +1,2 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later

bridge/peo4c/__main__.py

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later
 """peo4c bridge: serves neo4j-browser and translates Bolt/Cypher to PostgreSQL + AGE."""
 
 import asyncio

bridge/peo4c/agtype.py

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later
 """Parser for the text representation of AGE's ``agtype``.
 
 agtype text is JSON extended with ``NaN``/``Infinity`` and type annotations

bridge/peo4c/backend.py

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later
 """Executes Bolt queries against PostgreSQL + Apache AGE.
 
 Every Neo4j "database" maps to an AGE graph. The special ``system`` database

bridge/peo4c/bolt.py

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later
 """Bolt protocol server (raw TCP and WebSocket on the same port).
 
 Supports Bolt 4.4 and 5.0-5.4, which covers the neo4j-javascript-driver used

bridge/peo4c/cypher.py

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later
 """Light-weight Cypher text analysis needed to run queries through AGE.
 
 AGE's ``cypher()`` SQL function needs the caller to declare the result columns

bridge/peo4c/packstream.py

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later
 """PackStream v1 serialisation, the binary value format used by Bolt."""
 
 import struct

bridge/peo4c/web.py

@@ -1,3 +1,5 @@
+# SPDX-FileCopyrightText: 2026 Bart Broere
+# SPDX-License-Identifier: GPL-3.0-or-later
 """Tiny HTTP server for the neo4j-browser static files and Neo4j discovery."""
 
 import asyncio