libtmux(textframe): Move core module to src/libtmux/textframe/

why: Enable distribution of TextFrame for downstream users.
what:
- Move tests/textframe/core.py → src/libtmux/textframe/core.py
- Create src/libtmux/textframe/__init__.py with public API exports
- Update test imports to use libtmux.textframe

Author: tony

src/libtmux/textframe/__init__.py

@@ -0,0 +1,7 @@
+"""TextFrame - ASCII terminal frame simulator with pytest/syrupy integration."""
+
+from __future__ import annotations
+
+from libtmux.textframe.core import ContentOverflowError, TextFrame
+
+__all__ = ["ContentOverflowError", "TextFrame"]

tests/textframe/core.py src/libtmux/textframe/core.pytests/textframe/core.py renamed to src/libtmux/textframe/core.py

@@ -8,7 +8,8 @@
 import pytest
 from syrupy.assertion import SnapshotAssertion
 
-from .core import TextFrame
+from libtmux.textframe import TextFrame
+
 from .plugin import TextFrameExtension
 
 

tests/textframe/conftest.py

@@ -10,7 +10,7 @@
 
 from syrupy.extensions.single_file import SingleFileSnapshotExtension, WriteMode
 
-from .core import ContentOverflowError, TextFrame
+from libtmux.textframe import ContentOverflowError, TextFrame
 
 
 class TextFrameExtension(SingleFileSnapshotExtension):

tests/textframe/plugin.py

@@ -8,7 +8,7 @@
 import pytest
 from syrupy.assertion import SnapshotAssertion
 
-from .core import ContentOverflowError, TextFrame
+from libtmux.textframe import ContentOverflowError, TextFrame
 
 if t.TYPE_CHECKING:
     from collections.abc import Sequence