Fix __version__ to read from package metadata instead of hardcoded string

[davidmoserai]

Problem

comfy_kitchen.__version__ reports "0.1.0" regardless of the actual installed version. This has been the case since the first release — the version string was hardcoded in two places and never updated during any version bump:

# comfy_kitchen/__init__.py (line 19)
__version__ = "0.1.0"

// comfy_kitchen/backends/cuda/dlpack_bindings.cpp (line 557)
m.attr("__version__") = "0.1.0";

Every version bump commit (0.1.6 → 0.2.0, 0.2.2, 0.2.3, 0.2.5, 0.2.6, 0.2.7) only modified pyproject.toml, leaving these hardcoded strings unchanged.

Real-world impact

This caused significant debugging confusion in our production inference pipeline. When investigating CUDA backend issues, our startup diagnostics reported comfy-kitchen 0.1.0 at runtime. Since version 0.1.0 was the initial release with known limitations, we spent considerable time trying to force-upgrade the package — only to discover that pip show comfy-kitchen correctly reported 0.2.7 all along. The __version__ attribute was simply wrong.

The mismatch between importlib.metadata.version("comfy-kitchen") (correct: 0.2.7) and comfy_kitchen.__version__ (wrong: 0.1.0) is confusing for anyone doing version checks or runtime diagnostics.

Fix

comfy_kitchen/__init__.py: Replace the hardcoded string with importlib.metadata.version(), which reads from the package metadata set by pyproject.toml — the single source of truth. Includes a PackageNotFoundError fallback for editable/dev installs.

# Before
__version__ = "0.1.0"

# After
try:
    from importlib.metadata import version, PackageNotFoundError
    __version__ = version("comfy-kitchen")
except PackageNotFoundError:
    __version__ = "0.0.0"  # Fallback for editable/dev installs

dlpack_bindings.cpp: Removed the hardcoded m.attr("__version__") = "0.1.0" from the C++ nanobind module. The Python-level __version__ is the canonical source, and nobody accesses _C.__version__ directly.

This is the recommended approach for single-sourcing the package version in modern Python packaging.

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