April 2026 monthly summary for cardano-scaling/hydra: Implemented CI Permissions Fix to skip the tx-cost-diff job for external Contributor PRs while always uploading an artifact for review, preserving visibility of transaction cost differences without requiring GitHub PR comments; resolved permission issues that blocked external contributors from PR feedback. This aligns with existing CI patterns (ci-nix.yaml) and improves CI reliability and external collaboration.

March 2026 performance snapshot across two critical repositories: hydra and scala3. Key user-facing enhancement delivered in hydra: clarified the CLI --peer option help text to indicate it refers to parties rather than peers, improving usability and reducing potential confusion for operators. Major diagnostic improvement in Scala 3: restored emission of the MatchTypeNoCases warning in TypeComparer.matchCases, ensuring that the warning appears under the correct conditions to aid user diagnostics and avoid noisy or misleading messages. Local validation of the diagnostic behavior was performed with targeted sbt tests (e.g., tests for 23822, 24753, 12974, i12049, and matchtype-seq) to confirm correct behavior and source-position handling. Commit highlights: hydra - Fix --peer help text to refer to parties (9501402d8c71523599239326eee17535da58036f); scala3 - Restore MatchTypeNoCases warning with correct source position (#25470) (d5346204...).