refactor(setup): modernize string formatting and ensure explicit file encoding

[ardozcnn]

Description

This PR modernizes the setup.py build configuration script by refactoring legacy .format() string formatting to modern Python f-strings. Additionally, it explicitly enforces encoding="utf-8" in find_version() to ensure cross-platform consistency and prevent encoding errors on non-UTF-8 default environments (e.g., Windows).

Related issues

Related to code cleanup and build script maintenance.

Additional information

• Refactored .format() calls to f-strings across setup.py.
• Added explicit encoding="utf-8" when reading version files.
• Replaced slice-based extension checking ([-3:] == ".py") with .endswith(".py").
• No functional or breaking changes introduced to the build pipeline.

[gemini-code-assist]

Code Review

This pull request refactors python/setup.py by converting string concatenations to f-strings and removing numerous comments and docstrings. The review feedback focuses on restoring these removed comments and docstrings, as they provide critical context regarding platform-specific workarounds (such as Windows symlink/junction behavior and WSL exclusion), design decisions (like excluding the LLM extra from the main bundle), and developer synchronization instructions. Additionally, one comment was flagged for containing git history details rather than code-specific documentation.

[ardozcnn]

Thanks for the review! I have restored all the removed docstrings and architectural/platform comments across setup.py while keeping the f-string refactoring and encoding="utf-8" fix intact.

[ardozcnn]

Can you review please.