feat: Unified pipeline lifecycle - single S3 file per pipeline - Pipeline now stored in S3 with pipeline_id at creation - Proposals stored in S3, only reference in MongoDB - Results appended to same S3 file on completion - Workflow save uses pipeline_id, works at any stage - pipelines_history now in session API response

feat: Display final_output_url in pipeline completion message - shows presigned S3 URL where all component outputs are stored with expiry time

fix: Add missing execution_id initialization

feat: Complete file upload V3 integration

feat: Implement remaining V3 architecture fixes

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