cvista

Sweep recently merged upstream VTK merge requests, triage the bug fixes and features that matter to cvista's shipped modules, and land each as its own PR linked back to the original MR. Use when asked to check upstream VTK for backports, catch cvista up on upstream fixes, or port a specific VTK MR. Drives the vtk-backport-engineer agent for the per-MR landing work.

How cvista trims VTK down to PyVista's module closure — the three levers (module deny-list, NOWRAP classes, NOCOMPILE classes), the CVISTA_KEEP_CLASSES override, closure rules, and how to add, remove, or restore a class or module safely. Load when a PyVista path needs a class cvista dropped, when shrinking the wheel further, or when a build fails because something is missing.

The cvista bit-exact parity contract — the two buckets (byte-identical default-on vs opt-in EnableFast), the bitexact / renderexact / regression gates, how to run them locally, and the checklist for adding a fast filter. Load when touching any filter, kernel, render path, or build lever, or when reasoning about whether a change can ship on by default.