November 2025 monthly summary for Plonky3/Plonky3 focused on delivering business value through architecture-enhancing features and solid quality improvements. Key feature delivery: preprocessed columns support in the Uni-Stark framework, enabling robust handling of preprocessed traces within the verification and proving pipeline. This lays groundwork for faster proof generation on larger circuits and improved trace integrity. Major bugs fixed: none reported in this scope. Ongoing reliability is maintained via added tests and structured changes. Overall impact and accomplishments: introduced end-to-end support for preprocessed traces, expanding the Uni-Stark workflow with new helpers, trait updates, and tests; improved trace processing efficiency by ensuring preprocessed_trace is invoked only once in the prover, and established a concrete path for preprocessed data commitments. The work enhances scalability, security, and maintainability of the Plonky3 proving ecosystem, enabling smoother integration of preprocessed data into production-proof flows. Technologies/skills demonstrated: Rust-based verifier/prover helpers (process_preprocessed_trace, commit_preprocessed_trace), DebugConstraintBuilder enhancements (PairBuilder support), Air trait extension for preprocessed_trace with degree parameter, PCS trait augmentation with PREPROCESSED_TRACE_IDX, and comprehensive test coverage (including mul_fib_pair.rs) to validate correctness and tamper-resistance.