Dataset show improvements

[JonasIsensee]

This is experimental ai coding work with Claude and copilot.

Will hopefully be add a few features in this way that are tedious to implement, test and document but provide quality of life improvements for users.

[Copilot]

Pull Request Overview

This PR introduces comprehensive improvements to dataset display functionality, including enhanced introspection for Julia data types and extensive test coverage. The changes provide better error handling and more informative display output for JLD2 datasets.

• Adds safe type introspection capabilities that avoid type reconstruction errors during dataset display
• Implements comprehensive test suite for dataset show functionality with multiple test scenarios
• Updates test artifacts to version 0.1.9 for expanded test coverage

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/test_files.jl	Updates test artifact version to 0.1.9 with sync comment
test/test_dataset_show.jl	New comprehensive test suite for dataset display functionality
test/runtests.jl	Includes the new dataset show test file
test/Artifacts.toml	Updates artifact references to version 0.1.9
src/explicit_datasets.jl	Major enhancement of dataset display with safe introspection and detailed documentation
src/datatypes.jl	Adds julia_repr method for FixedLengthString
src/data/specialcased_types.jl	Minor whitespace addition
src/committed_datatype_introspection.jl	New comprehensive safe introspection system for committed datatypes
src/Filters.jl	Fixes FilterPipeline constructor type annotation

Comments suppressed due to low confidence (1)

src/explicit_datasets.jl:1

• Magic number 0x37 should be defined as a named constant. Consider defining const DT_REFERENCE = 0x37 to improve code readability and maintainability.

#=

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[codecov]

Codecov Report

❌ Patch coverage is 89.69072% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.44%. Comparing base (36349bb) to head (c76ea85).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/committed_datatype_introspection.jl	83.78%	6 Missing ⚠️
src/explicit_datasets.jl	92.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #680      +/-   ##
==========================================
+ Coverage   85.37%   88.44%   +3.06%     
==========================================
  Files          37       37              
  Lines        4445     4481      +36     
==========================================
+ Hits         3795     3963     +168     
+ Misses        650      518     -132     

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