add --version and bump to 0.2.0

Resolve the package version from installed metadata, report it via a
--version flag, and print it at the start of each run so output logs
record which wikiq produced them. Bump the version to 0.2.0 for the
changes on this branch: regex match counting, the removal of parquet
output, the Python 3.11 floor, and the dependency cleanup.

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

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "mediawiki-dump-tools"
-version = "0.1.1"
+version = "0.2.0"
 description = "Convert MediaWiki XML database dumps into tabular datasets for research"
 readme = "README.md"
 license = "GPL-3.0-or-later"

src/wikiq/__init__.py

@@ -48,6 +48,13 @@ from wikiq.wiki_diff_matcher import WikiDiffMatcher
 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
@@ -1099,6 +1106,12 @@ 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",
@@ -1343,6 +1356,7 @@ 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: