chore(release): 0.3.0

Set the package and lock metadata for the Docker isolation release.

Verified 897 tests on Windows, 886 tests in Ubuntu 22.04 WSL, the page module
suite, and launcher line endings with all required font faces supplied.

Author: CrazyCoder

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "crossglyph"
-version = "0.2.1"
+version = "0.3.0"
 description = "Build and tune CrossPoint .cpfont families for Xteink e-readers"
 requires-python = ">=3.12"
 dependencies = ["pillow>=10", "fonttools>=4.50",