GROOVY-11974: stub generator could emit records into stubs when in na…

[paulk-asert]

…tive records mode

https://issues.apache.org/jira/browse/GROOVY-11974

[Copilot]

Pull request overview

Fixes GROOVY-11974 by ensuring joint-compilation stub generation preserves Java record semantics for Groovy “native records”, so Java sources compiled against the stubs can see the canonical constructor and componentName() accessors.

Changes:

• Add RecordTypeASTTransformation.wouldBeNativeRecord(...) to predict native-record outcome before the record transform runs.
• Update JavaStubGenerator to emit record Foo(...) stubs (and avoid emitting illegal record constructs like instance fields / explicit final / extends Object).
• Add a joint-compilation stub test covering record-stub header and forbidden stub elements.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/test/groovy/org/codehaus/groovy/tools/stubgenerator/RecordTypeJointCompilationStubTest.groovy	Adds regression test ensuring generated stubs use record syntax and omit invalid record elements.
src/main/java/org/codehaus/groovy/transform/RecordTypeASTTransformation.java	Introduces a pre-transform predicate for “would compile as native record” and refactors native-record decision logic to reuse it.
src/main/java/org/codehaus/groovy/tools/javac/JavaStubGenerator.java	Emits record headers for native-record stubs and adjusts field/constructor emission to satisfy javac record rules.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.79487% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.0793%. Comparing base (a71d56f) to head (b393a1a).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...codehaus/groovy/tools/javac/JavaStubGenerator.java	78.5714%	2 Missing and 4 partials ⚠️
.../groovy/transform/RecordTypeASTTransformation.java	54.5454%	0 Missing and 5 partials ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2502        +/-   ##
==================================================
- Coverage     67.0834%   67.0793%   -0.0041%     
- Complexity      31740      31755        +15     
==================================================
  Files            1465       1465                
  Lines          123327     123354        +27     
  Branches        22089      22102        +13     
==================================================
+ Hits            82732      82745        +13     
- Misses          33499      33502         +3     
- Partials         7096       7107        +11     

Files with missing lines	Coverage Δ
.../groovy/transform/RecordTypeASTTransformation.java	84.7273% <54.5454%> (-1.3021%)	⬇️
...codehaus/groovy/tools/javac/JavaStubGenerator.java	86.1472% <78.5714%> (-0.1009%)	⬇️

... and 4 files with indirect coverage changes

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