declare pywikidiff2 as a PEP 508 direct reference over https

Move pywikidiff2 from a [tool.uv.sources] entry to a direct git URL in
the dependency list, and switch it from ssh to anonymous https. The ssh
URL required an account on the gitea instance just to install the
package. A PEP 508 direct reference is understood by pip and every other
standards-compliant installer, not just uv, so this is a step toward
making uv an optional convenience rather than a requirement for working
with this repository.

Hatchling rejects direct references by default because they are not
allowed in packages published to PyPI (this one is not); set
tool.hatch.metadata.allow-direct-references to permit them.

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

pyproject.toml

@@ -14,7 +14,7 @@ dependencies = [
     "mwtypes>=0.4.0",
     "mwxml>=0.3.6",
     "pyarrow>=20.0.0",
-    "pywikidiff2",
+    "pywikidiff2 @ git+https://gitea.communitydata.science/groceryheist/pywikidiff2.git",
     "sortedcontainers>=2.4.0",
     "yamlconf>=0.2.6",
 ]
@@ -29,12 +29,14 @@ build-backend = "hatchling.build"
 [tool.hatch.build.targets.wheel]
 packages = ["src/wikiq"]
 
+[tool.hatch.metadata]
+allow-direct-references = true
+
 [tool.uv.sources]
 
 yamlconf = { git = "https://github.com/groceryheist/yamlconf" }
 mwxml = { git = "https://github.com/groceryheist/python-mwxml" }
 deltas = { git = "https://github.com/groceryheist/deltas" }
-pywikidiff2 = { git = "ssh://gitea@gitea.communitydata.science:2200/groceryheist/pywikidiff2.git"}
 
 [dependency-groups]
 dev = [