desire

Running the XRootD proxy file cache with 4 kB blocks, and making it usable over a wide-area path.

Radiation and interaction length along chosen paths through a detector geometry — where the material actually sits, and where a direction-averaged budget misleads.

mkFit hit search: an exact propagator, two search-window bugs from one moved invariant, and the measurement that blames the covariance rather than the search — two thirds of true hits rejected at the Kalman χ² cut.

Clearing the obvious suspect for the LST-into-pixels efficiency loss, and building the tracing that made the rest measurable. Includes an RDF deadlock that was never a threading problem.