Add comprehensive test coverage improvements

[marevol]

• Add RawTextElementsTest.java for script/style/textarea/title element handling
• Add StrictModeTest.java for nekohtml.dom.strict system property testing
• Add BrowserQuirksIntegrationTest.java for browser quirks and implied elements
• Extend SimpleHTMLScannerEnhancementsTest with entity and encoding tests
• Extend AdoptionAgencyAlgorithmExtendedTest with AAA loop limit, formatting marker, and table context tests
• Extend HTMLSAXConfigurationTest with feature combination and property tests
• Extend PerformanceStressTest with concurrent parsing, stress patterns, and real-world simulation tests

[Copilot]

Pull request overview

This PR significantly expands test coverage across multiple test suites to validate comprehensive HTML parsing behavior, edge cases, and stress scenarios in the NekoHTML library.

Changes:

• Adds new test files for raw text elements, strict mode handling, and browser quirks compatibility
• Extends existing test suites with entity handling, encoding variations, handler management, feature combinations, and concurrent/stress testing scenarios
• Introduces tests for the Adoption Agency Algorithm's loop limits, formatting markers, and complex nesting patterns

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
SimpleHTMLScannerEnhancementsTest.java	Adds tests for entity handling (named, numeric, incomplete), encoding variations (ISO-8859-1, UTF-16, UTF-8), input source handling, and SAX handler management
RawTextElementsTest.java	New file testing raw text element handling for script, style, textarea, title, and deprecated elements with various content patterns
HTMLSAXConfigurationTest.java	Extends with feature combination tests, property management, pipeline configuration, handler getters/setters, and complex feature interactions
AdoptionAgencyAlgorithmExtendedTest.java	Adds comprehensive tests for AAA outer loop limits, formatting markers in table contexts, special scope elements, and stress scenarios
StrictModeTest.java	New file testing nekohtml.dom.strict system property behavior across default, lenient, and strict modes with edge cases
BrowserQuirksIntegrationTest.java	New file testing browser quirks compatibility including implied elements, table quirks, form handling, list patterns, and DOCTYPE variations
PerformanceStressTest.java	Extends with deep nesting tests, concurrent parsing validation, misnesting patterns, and complex real-world page simulations

Comments suppressed due to low confidence (1)

src/test/java/org/codelibs/nekohtml/sax/SimpleHTMLScannerEnhancementsTest.java:2

• The copyright year is set to 2025, which is in the future. The current date is January 10, 2026, so the copyright notice should be updated to include 2026.

 * Copyright 2012-2025 CodeLibs Project and the Others.

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