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#97: Refactor MigrationScriptExecutor using Orchestrator Pattern

Extracted complex workflows from MigrationScriptExecutor into 6 specialized
orchestrator services, reducing executor from 1030 to 218 lines.

New orchestrators:
- MigrationWorkflowOrchestrator - Coordinates migration workflow
- MigrationValidationOrchestrator - Validation and integrity checks
- MigrationReportingOrchestrator - Rendering and logging
- MigrationErrorHandler - Error recovery and rollback
- MigrationHookExecutor - Lifecycle hook execution
- MigrationRollbackManager - Rollback operations

Changes:
- Created 6 orchestrator interfaces and implementations
- Refactored executor to delegate to orchestrators
- Updated tests to use public API, maintained 100% coverage
- Added orchestrator pattern documentation with UML diagrams
- Restructured version migration sidemenu

No breaking changes - public API unchanged.

1136 of 1136 branches covered (100.0%)

Branch coverage included in aggregate %.

2270 of 2270 relevant lines covered (100.0%)

280.38 hits per line