[FEATURE] Composable extraction pipeline with stage registry and typed contracts#241

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mykola-pereyma:feature/composable-extraction-pipeline

Commits on May 14, 2026

Add ExtractionStage ABC for composable pipeline stages
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Add SchemaFilterStage for schema-based post-extraction filtering
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Wire stages and schema params into ExtractionConfig
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Add composable extraction pipeline example notebook
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Auto-inject schema constraints into LLM topic extraction prompt
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Fix prompt tests for schema_constraints and Pydantic V2 deprecation
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Address review findings: from_stages() factory, chunking fix, observability, NER error handling
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Remove validation guide from public docs
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