feat: add advanced architecture, documentation, and coverage improvements (#65)

* fix(style): resolve PHPCS line-length warnings in source files

* fix(style): resolve PHPCS line-length warnings in test files

* feat(audit): add structured audit logging with ErrorContext and AuditContext

- ErrorContext: standardized error information with sensitive data sanitization
- AuditContext: structured context for audit entries with operation types
- StructuredAuditLogger: enhanced audit logger wrapper with timing support

* feat(recovery): add recovery mechanism for failed masking operations

- FailureMode enum: FAIL_OPEN, FAIL_CLOSED, FAIL_SAFE modes
- RecoveryStrategy interface and RecoveryResult value object
- RetryStrategy: exponential backoff with configurable attempts
- FallbackMaskStrategy: type-aware fallback values

* feat(strategies): add CallbackMaskingStrategy for custom masking logic

- Wraps custom callbacks as MaskingStrategy implementations
- Factory methods: constant(), hash(), partial() for common use cases
- Supports exact match and prefix match for field paths

* docs: add framework integration guides and examples

- symfony-integration.md: Symfony service configuration and Monolog setup
- psr3-decorator.md: PSR-3 logger decorator pattern implementation
- framework-examples.md: CakePHP, CodeIgniter 4, Laminas, Yii2, PSR-15
- docker-development.md: Docker development environment guide

* chore(docker): add Docker development environment

- Dockerfile: PHP 8.2-cli-alpine with Xdebug for coverage
- docker-compose.yml: development services with volume mounts

* feat(demo): add interactive GDPR pattern tester playground

- PatternTester.php: pattern testing utility with strategy support
- index.php: web API endpoint with JSON response handling
- playground.html: interactive web interface for testing patterns

* docs(todo): update with completed medium priority items

- Mark all PHPCS warnings as fixed (81 → 0)
- Document new Audit and Recovery features
- Update test count to 1,068 tests with 2,953 assertions
- Move remaining items to low priority

* feat: add advanced architecture, documentation, and coverage improvements

- Add architecture improvements:
  - ArrayAccessorInterface and DotArrayAccessor for decoupled array access
  - MaskingOrchestrator for single-responsibility masking coordination
  - GdprProcessorBuilder for fluent configuration
  - MaskingPluginInterface and AbstractMaskingPlugin for plugin architecture
  - PluginAwareProcessor for plugin hook execution
  - AuditLoggerFactory for instance-based audit logger creation

- Add advanced features:
  - SerializedDataProcessor for handling print_r/var_export/serialize output
  - KAnonymizer with GeneralizationStrategy for GDPR k-anonymity
  - RetentionPolicy for configurable data retention periods
  - StreamingProcessor for memory-efficient large log processing

- Add comprehensive documentation:
  - docs/performance-tuning.md - benchmarking, optimization, caching
  - docs/troubleshooting.md - common issues and solutions
  - docs/logging-integrations.md - ELK, Graylog, Datadog, etc.
  - docs/plugin-development.md - complete plugin development guide

- Improve test coverage (84.41% → 85.07%):
  - ConditionalRuleFactoryInstanceTest (100% coverage)
  - GdprProcessorBuilderEdgeCasesTest (100% coverage)
  - StrategyEdgeCasesTest for ReDoS detection and type parsing
  - 78 new tests, 119 new assertions

- Update TODO.md with current statistics:
  - 141 PHP files, 1,346 tests, 85.07% line coverage

* chore: tests, update actions, sonarcloud issues

* chore: rector

* fix: more sonarcloud fixes

* chore: more fixes

* refactor: copilot review fix

* chore: rector

composer.json

@@ -10,12 +10,14 @@
       "@lint:tool:ec",
       "@lint:tool:psalm",
       "@lint:tool:phpstan",
-      "@lint:tool:phpcs"
+      "@lint:tool:phpcs",
+      "@lint:tool:md"
     ],
     "lint:fix": [
       "@lint:tool:rector",
       "@lint:tool:psalm:fix",
       "@lint:tool:phpcbf",
+      "@lint:tool:md:fix",
       "@lint:tool:ec:fix"
     ],
     "test": "XDEBUG_MODE=coverage ./vendor/bin/phpunit --coverage-text",
@@ -24,11 +26,13 @@
     "lint:tool:ec": "./vendor/bin/ec *.md *.json *.yml *.yaml *.xml *.php",
     "lint:tool:ec:fix": "./vendor/bin/ec *.md *.json *.yml *.yaml *.xml *.php --fix",
     "lint:tool:phpcs": "./vendor/bin/phpcs src/ tests/ examples/ config/ rector.php --warning-severity=0",
-    "lint:tool:phpcbf": "./vendor/bin/phpcbf src/ tests/ examples/ config/ rector.php",
+    "lint:tool:phpcbf": "./vendor/bin/phpcbf src/ tests/ examples/ config/ rector.php || [ $? -eq 2 ]",
     "lint:tool:phpstan": "./vendor/bin/phpstan analyse --memory-limit=1G",
     "lint:tool:psalm": "./vendor/bin/psalm --show-info=true",
     "lint:tool:psalm:fix": "./vendor/bin/psalm --alter --issues=MissingReturnType,MissingParamType,MissingClosureReturnType",
-    "lint:tool:rector": "./vendor/bin/rector"
+    "lint:tool:rector": "./vendor/bin/rector",
+    "lint:tool:md:fix": "markdownlint -f '**/*.md'",
+    "lint:tool:md": "markdownlint '**/*.md'"
   },
   "require": {
     "php": "^8.2",