feat: replace hardcoded __version__ with git-tag-based versioning

[aryanputta]

Fixes #45

Description

The version number in this package was hardcoded as a string in src/aiu_trace_analyzer/__init__.py. This means every release requires a manual commit to bump it, which is error-prone and easy to forget.

This PR switches to git-tag-based versioning using setuptools-scm. The version is now derived automatically from the current git tag. If the package is installed from a checkout that is not on a tagged commit, the version will include a dev suffix. If the package is not installed at all, it falls back to "unknown".

Changes Made

• pyproject.toml: added setuptools-scm>=8 to build requirements and added an empty [tool.setuptools_scm] section to activate git-tag versioning
• src/aiu_trace_analyzer/__init__.py: replaced __version__ = "1.0.2" with an importlib.metadata lookup that reads the version from the installed package metadata

How Was This Tested?

• Manual Verification: Confirmed the package still imports correctly and version resolves to the expected value when installed.

AI Usage Disclosure

• No AI used.

[lasch]

@aryanputta thank you for starting this effort, really appreciated!

There are a few minor things to address to make the build process and checks happy.

• the DCO check complains about some of the commits missing a 'sign-off'
• the build process complains about simultaneous use of 'setuptools.dynamic' and 'setuptools-scm'.

[aryanputta]

Will check right now and fix it also just started doing open source so any advice will be great.

[lasch]

NP. Take it easy.

• to fix the sign-off thing, you'll probably need to rebase your commits and use the --signoff flag. I think, clicking on that DCO has explanations of the processes.
• the other item seems to indicate that removing the last 2 lines from the pyproject.toml could do the trick, but I haven't checked that.

[aryanputta]

Yeah I'll work on it , thanks for the advice. If you have any other things you'd like me to work on after this let me know. Thanks!

[lasch]

An appreciated addition. Looks good. Thx.

Before merging, it requires the commits to have both:

• sign-off and
• verified signature
  The first version had the verified signature but no sign-off, this time it's the other way around.
  Should be an easy fix. Otherwise, good to go.