test: version assertions read the real version, not a pinned literal

Bumping to 2.10.0 broke three tests that hardcoded the version string. Read
index_graph.__version__ (and assert semver) so a version bump never breaks
the build again.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: HarperZ9

tests/test_cli.py

@@ -6,10 +6,13 @@
 
 
 def test_version_flag_exits_zero(capsys):
+    import index_graph
+
     with pytest.raises(SystemExit) as exc:
         main(["--version"])
     assert exc.value.code == 0
-    assert "2.9.0" in capsys.readouterr().out
+    # Assert the CLI reports the real package version, not a pinned literal.
+    assert index_graph.__version__ in capsys.readouterr().out
 
 
 def test_json_to_stdout(tmp_path, capsys):

tests/test_version.py

@@ -1,5 +1,9 @@
+import re
+
 import index_graph
 
 
-def test_version_is_2_8_0():
-    assert index_graph.__version__ == "2.9.0"
+def test_version_is_semver():
+    # Read the real version rather than pin a literal: the string is bumped every
+    # release and a hardcoded assertion just breaks the build on the bump commit.
+    assert re.fullmatch(r"\d+\.\d+\.\d+", index_graph.__version__)

tests/test_viz_cli.py

@@ -77,9 +77,11 @@ def test_existing_commands_unaffected(workspace, tmp_path, capsys):
     assert json.loads(capsys.readouterr().out)  # still valid JSON
 
 
-def test_version_is_2_8_0():
+def test_version_is_semver():
+    import re
+
     from index_graph import __version__
-    assert __version__ == "2.9.0"
+    assert re.fullmatch(r"\d+\.\d+\.\d+", __version__)
 
 
 def test_all_format_no_external_is_consistent(workspace_with_external, tmp_path):