Report why a simulation setup library cannot be loaded

This replaces the asserts in execFromPlugin by fatal messages with the reason.

- A failed dlopen of libO2G4Setup and friends stopped at assert(libHandle), without the error from dlerror().
- The message now gives the dlopen error, e.g. a missing static TLS reserve for Geant4 built with the initial-exec TLS model.
- The library is opened once, with the platform suffix from DLLoaderBase.h.
- A fair::FatalException follows the fatal message, since LOG(fatal) ends the process only when a fatal handler is installed.

https://its.cern.ch/jira/browse/O2-7305

Co-Authored-By: Claude Opus 5.5 <[email protected]>

DPL Analysis: send CCDB tables together with the objects they refer to (

#16079)

Seed the Cave chunk seeding through the transport generator

Cave::BeginPrimary seeded gRandom directly; it now uses o2::base::simRandom() like the other transport-time seeding.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

GPU Metal: relink the backend library when the kernels change (#16076)

GPU Metal: do not let Metal track hazards on the memory buffers (#16068)

Tagging AliceO2 version async-2026-PbPb-apass1-v9

Tagging AliceO2 version async-2026-PbPb-apass1-v8

Tagging AliceO2 version async-2025-PbPb-apass2-v8

GPU Metal: report command buffers that failed on the device

DrainStream waited for the submitted command buffers but never looked at
their status, so a kernel that faulted or hung only showed up as missing
output. Print the Metal error of a failed buffer.

TPC SCD: round instead of truncate when packing the unbinned residuals (

#16046)

Co-authored-by: Claude Opus 5.5 <[email protected]>