Probe -O2 Linux LLVM 21 build (temporary, fork only)

Workflow runs for Probe -O2 Linux LLVM 21 build (temporary, fork only)

• ci: probe -O2 LLVM 21 build (fork only, not for upstream)

  completed successfully:
  Probe -O2 Linux LLVM 21 build (temporary, fork only)#1:Commit201a755pushedbycertik
  probe-o2-21

  Oct 11, 202612m 24s
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