👌 Honor -D overrides when loading needs_from_toml

[chrisjsewell]

Keep Sphinx CLI config overrides (-D / confoverrides) authoritative in load_config_from_toml by skipping TOML assignments for keys that were already overridden.

• Read override keys from config.overrides
• Skip setting needs_<key> when <key> or needs_<key> is overridden
• Skip setting schema entries when needs_schema_ or needs_schema_<key> is overridden
• Add regression test verifying TOML does not overwrite needs_reproducible_json when provided via confoverrides

This preserves expected precedence: CLI overrides > TOML values > defaults.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.38%. Comparing base (4e10030) to head (4b12009).
⚠️ Report is 290 commits behind head on master.

Files with missing lines	Patch %	Lines
sphinx_needs/needs.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1717      +/-   ##
==========================================
+ Coverage   86.87%   89.38%   +2.50%     
==========================================
  Files          56       74      +18     
  Lines        6532    10592    +4060     
==========================================
+ Hits         5675     9468    +3793     
- Misses        857     1124     +267     

Flag	Coverage Δ
pytests	89.38% <81.81%> (+2.50%)	⬆️

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[ubmarco]

Good change