fix: derive __version__ from package metadata

[haeter525]

Closes #13.

Problem

__version__ was a hardcoded literal in src/dextrace/version.py that drifted from pyproject.toml. In 26.6.1, pip show dextrace reported 26.6.1 while dextrace -V printed DexTrace 25.10.1.

Fix

Read the version from importlib.metadata so pyproject.toml is the single source of truth:

from importlib.metadata import version, PackageNotFoundError

try:
    __version__ = version("dextrace")
except PackageNotFoundError:  # running from a source tree without an install
    __version__ = "0.0.0+dev"

Verification

• pip install -e . then dextrace -V → DexTrace 26.6.1 (matches pip show)
• No new runtime dependency — importlib.metadata is stdlib (Python ≥3.8)

Note

This corrects the CLI version for the next release. PyPI is immutable, so the already-published 26.6.1 keeps reporting 25.10.1; the fix takes effect when a 26.6.2 is cut.

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