Derive Sphinx versions dynamically

[njzjz]

Summary

• derive release from setuptools-scm in source checkouts
• fall back to installed distribution metadata and then 0+unknown
• derive the short Sphinx version from the resolved release

Fixes #129.

Validation

• Executed docs/conf.py and verified non-placeholder version values
• Ruff checks on docs/conf.py

AI attribution

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

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📥 Commits

Reviewing files that changed from the base of the PR and between 66c7d8b and 80adc3a.

📒 Files selected for processing (1)

• docs/conf.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.14%. Comparing base (66c7d8b) to head (80adc3a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #148   +/-   ##
=======================================
  Coverage   75.14%   75.14%           
=======================================
  Files           9        9           
  Lines         853      853           
=======================================
  Hits          641      641           
  Misses        212      212           

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