Add uv.lock and ignore local venv/test artifacts

`uv sync` pins the dev dependencies (pytest, pytest-asyncio) declared in
pyproject.toml; commit the lockfile so the test environment is
reproducible. Ignore myvenv/, .venv/, .pytest_cache/ and *.egg-info/.

.gitignore

@@ -11,6 +11,10 @@ chattolib_vendor/
 __pycache__/
 *.py[cod]
 *$py.class
+.venv/
+myvenv/
+*.egg-info/
+.pytest_cache/
 
 # OS
 .DS_Store

uv.lock

@@ -0,0 +1,105 @@
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