Add A11yAgent static analysis toolchain with 32 WCAG accessibility rules

[pauljadam]

Summary

• A11yAgent: CLI tool with 32 rules mapped to WCAG 2.2, supporting multiple output formats (terminal, Gradle, JSON, SARIF, HTML), baseline suppression, per-composable scoring, trend tracking, and rule documentation generation
• lint-checks: Android Lint integration providing the same 32 rules as real-time editor squiggly underlines in Android Studio
• ide-plugin: IntelliJ Platform plugin for inline accessibility warnings using the ExternalAnnotator API
• gradle-plugin: Gradle task wrapper (./gradlew a11yCheck) for CI/CD integration
• Pre-commit hook and GitHub Actions workflow for automated accessibility checks
• Includes new Label in Name rule (WCAG 2.5.3) — ERROR if visible text not in accessible name, WARNING if present but not at start

What's included

Module	Description
A11yAgent/	Kotlin CLI with 32 WCAG rules, scanner, formatters, baseline, scoring
lint-checks/	5 Android Lint detectors (32 issues) with full test suite
ide-plugin/	IntelliJ/Android Studio plugin for real-time squiggly underlines
gradle-plugin/	Gradle plugin wrapping A11yAgent shadow JAR
.githooks/	Pre-commit hook running A11yAgent on staged .kt files
.github/workflows/	CI workflow for automated accessibility checks

Test plan

• ./gradlew :A11yAgent:test — all unit tests pass (32 rules, scanner, baseline, scoring)
• ./gradlew :lint-checks:test — all lint detector tests pass
• ./gradlew :A11yAgent:shadowJar && java -jar A11yAgent/build/libs/a11y-check-android-0.1.0.jar --generate-docs — rule docs generate correctly
• cd ide-plugin && ./gradlew buildPlugin — IDE plugin builds successfully
• Run ./gradlew a11yCheck against app source to verify end-to-end

🤖 Generated with Claude Code