feat: Remove reasoning fields

[rmitsch]

Description

Removes all reasoning fields in task signatures. We consider this superfluous given today's generative models inbuilt steerable reasoning levels.

Related Issues

• Resolves Remove reasoning fields + processing #204.

Changes Made

• Removes reasoning fields in code and docs.

Checklist

• Tests have been extended to cover changes in functionality
• Existing and new tests succeed
• Documentation updated (if applicable)
• Related issues linked

Screenshots/Examples (if applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #205      +/-   ##
==========================================
- Coverage   92.63%   92.51%   -0.13%     
==========================================
  Files          63       63              
  Lines        3339     3298      -41     
==========================================
- Hits         3093     3051      -42     
- Misses        246      247       +1     

Files with missing lines	Coverage Δ
sieves/tasks/predictive/classification/bridges.py	88.18% <100.00%> (+0.11%)	⬆️
sieves/tasks/predictive/classification/core.py	94.76% <ø> (-0.07%)	⬇️
sieves/tasks/predictive/core.py	90.58% <ø> (-0.06%)	⬇️
...tasks/predictive/information_extraction/bridges.py	97.56% <100.00%> (-0.14%)	⬇️
...es/tasks/predictive/information_extraction/core.py	92.04% <ø> (-0.09%)	⬇️
sieves/tasks/predictive/ner/bridges.py	94.78% <ø> (-0.05%)	⬇️
sieves/tasks/predictive/pii_masking/bridges.py	98.54% <100.00%> (-0.08%)	⬇️
sieves/tasks/predictive/pii_masking/core.py	94.44% <ø> (-0.08%)	⬇️
...ves/tasks/predictive/question_answering/bridges.py	99.12% <100.00%> (-0.03%)	⬇️
sieves/tasks/predictive/question_answering/core.py	95.38% <ø> (-0.07%)	⬇️
... and 4 more

... and 1 file with indirect coverage changes

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