feat(02-01): extend ingestion to populate Phase 2 columns with integration tests
- Refactored flattenProcessors to flattenWithMetadata (FlatProcessor record with depth/parentIndex)
- INSERT now populates 12 new columns: exchange_bodies, exchange_headers, processor_depths,
processor_parent_indexes, processor_error_messages, processor_error_stacktraces,
processor_input_bodies, processor_output_bodies, processor_input_headers,
processor_output_headers, processor_diagram_node_ids, diagram_content_hash
- Exchange bodies/headers concatenated from all processor snapshots + route-level snapshots
- Null ExchangeSnapshot handled gracefully (empty string defaults)
- Headers serialized to JSON via Jackson ObjectMapper
- IngestionSchemaIT verifies 3-level tree metadata, body concatenation, null snapshot handling
- DiagramRenderer/DiagramLayout stubs created to fix pre-existing compilation error (Rule 3)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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