refactor: treat predicates as boolean functions

[Seddryck]

Summary

• model a single predication as one function and represent predicate pipelines explicitly
• resolve predicate members through the ordinary function pipeline, with strict Boolean validation only at predicate boundaries
• make AND, OR, and XOR shorthand bind to the same Boolean combinator functions used by their canonical forms
• support standalone and filter-contained transformation pipelines ending in predicates
• preserve relative record context in parenthesized map-shorthand arguments

Built on top of #661.

Validation

• solution build across net8.0, net9.0, and net10.0
• 215 focused tests on each target framework (645 total)
• 206 CLI tests
• complete nested customer/order projection using |> shorthand
• pre-push StyleCop check

Close #662
Close #668

[coderabbitai]

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[codecov]

Codecov Report

❌ Patch coverage is 77.77778% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.39%. Comparing base (b064c0c) to head (ad29df2).
⚠️ Report is 2 commits behind head on next-major.

Files with missing lines	Patch %	Lines
Expressif/Predicates/Boolean/BooleanCombinators.cs	80.00%	6 Missing and 1 partial ⚠️
Expressif/Functions/FunctionFactory.cs	75.00%	3 Missing and 2 partials ⚠️
Expressif/Serializers/PredicationSerializer.cs	0.00%	3 Missing ⚠️
Expressif/Predicates/BooleanFunctionPredicate.cs	77.77%	1 Missing and 1 partial ⚠️
Expressif.Cli/Commands/BoundTreeFormatter.cs	50.00%	1 Missing ⚠️
Expressif/Bindings/ExpressifBinder.cs	92.30%	0 Missing and 1 partial ⚠️
Expressif/Predicates/PredicationFactory.cs	80.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           next-major     #663      +/-   ##
==============================================
- Coverage       84.45%   84.39%   -0.07%     
==============================================
  Files             220      221       +1     
  Lines            6259     6273      +14     
  Branches         1111     1111              
==============================================
+ Hits             5286     5294       +8     
- Misses            643      650       +7     
+ Partials          330      329       -1     

Flag	Coverage Δ
expressif-cli-net10.0	40.06% <44.44%> (-0.77%)	⬇️
expressif-net10.0	81.52% <78.40%> (+0.04%)	⬆️
expressif-net8.0	81.52% <78.40%> (+0.04%)	⬆️
expressif-net9.0	81.52% <78.40%> (+0.04%)	⬆️

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[sonarqubecloud]

Quality Gate passed

Issues
9 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud