Add rake task to generate YARD docs

[bdurand]

Added

• The default data directory for support table data in Rails applications will be set to db/support_tables. This can also be overridden by setting the config.support_table_data_directory configuration option in the Rails application.
• Added rake task support_table_data:add_yard_docs for Rails applications that will add YARD documentation to support table models for the named instance helpers.

[Copilot]

Pull request overview

This PR adds a rake task for generating YARD documentation for support table model helper methods and establishes a configurable default data directory for Rails applications.

Key Changes

• Introduces support_table_data:add_yard_docs rake task that automatically generates YARD documentation comments for named instance helper methods
• Sets the default data directory to db/support_tables via a configurable Rails option (config.support_table_data_directory)
• Refactors test models from inline definitions to separate files using autoload for better organization

Reviewed changes

Copilot reviewed 41 out of 43 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
lib/support_table_data/documentation/yard_doc.rb	Generates YARD documentation strings for named instance methods, predicates, and attribute helpers
lib/support_table_data/documentation/source_file.rb	Manages source file reading/writing and intelligently inserts/updates YARD docs with marker comments
lib/support_table_data/documentation.rb	Module entry point that requires documentation components
lib/tasks/support_table_data.rake	Adds new add_yard_docs task and refactors eager loading logic
lib/tasks/utils.rb	Utility methods for Rails eager loading and finding support table models with their file paths
lib/support_table_data/railtie.rb	Configures default data directory via Rails config initializer
spec/support_table_data/documentation/yard_doc_spec.rb	Comprehensive tests for YARD documentation generation
spec/support_table_data/documentation/source_file_spec.rb	Tests for source file manipulation and YARD doc insertion/updating
spec/models/*.rb	Refactored model definitions into separate files
spec/models.rb	Converted to use autoload for lazy loading test models
test_app/	Complete test Rails application to validate rake task functionality
README.md	Documents the new YARD documentation feature and config option
CHANGELOG.md	Records changes for version 1.4.1
.github/workflows/continuous_integration.yml	Adds ActiveRecord 8.1 compatibility testing

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