Advanced contributor tooling

Reach for these optional extras when you need deeper instrumentation or performance tooling while maintaining the calibrated explanation contract.

• Plugin contract – Revisit the contract before layering advanced options on top of existing plugins.

• Tune runtime performance (opt-in) – Shared executor and cache guidance; reuse rather than reimplement parallelism.

• Optional telemetry scaffolding – Telemetry policies and consent messaging.

• Plot explanations with PlotSpec – Optional PlotSpec helpers for plugins that emit visual artefacts.