add --version and set the version to 0.3.0

wikiq had no way to report which version produced a dataset, which
matters when output columns change between runs that end up in the same
analysis. Add a --version flag, and print the version to stderr on every
run so it lands in job logs alongside the output.

0.3.0 is the first release published anywhere. The earlier 0.1.1 and
0.2.0 tags were internal markers that were never released, so the
version numbering starts being meaningful to users here.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mediawiki-dump-tools"
-version = "0.1.1"
+version = "0.3.0"
 description = "Convert MediaWiki XML database dumps into tabular datasets for research"
 readme = "README.md"
 license = "GPL-3.0-or-later"

src/wikiq/__init__.py

@@ -46,6 +46,13 @@ from wikiq.tables import RevisionTable
 from wikiq.wikitext_parser import WikitextParser
 from wikiq.resume import get_resume_point
 
+try:
+    from importlib.metadata import PackageNotFoundError
+    from importlib.metadata import version as _package_version
+    __version__ = _package_version("mediawiki-dump-tools")
+except PackageNotFoundError:
+    __version__ = "unknown"
+
 TO_ENCODE = ("title", "editor")
 PERSISTENCE_RADIUS = 7
 DIFF_TIMEOUT_MS = 60000
@@ -1134,6 +1141,12 @@ def main():
         help="Output file or directory. Format is detected from extension: .jsonl for JSONL, otherwise TSV.",
     )
 
+    parser.add_argument(
+        "--version",
+        action="version",
+        version=f"wikiq {__version__}",
+    )
+
     parser.add_argument(
         "-s",
         "--stdout",
@@ -1391,6 +1404,7 @@ def main():
         print(json.dumps(spark_schema, indent=2))
         sys.exit(0)
 
+    print(f"wikiq {__version__}", file=sys.stderr)
     print(args, file=sys.stderr)
     if len(args.dumpfiles) > 0:
         for filename in args.dumpfiles: