FFTW's planner (every fftwf_plan_* and fftwf_destroy_plan) shares global state
and is not thread-safe; executing a plan is. FFTIndexerCPU and BeamCenterFFTCPU
each guarded their planning with a lock of their own, TranslationalNCS and the
viewer's spectrum with none, and ModelFFT with a third - which does not stop
two of them planning at once. common/FFTWPlannerLock.h holds the one mutex they
all now take. No numerical change.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nW6FNRP1bBJJ8pfHiByAT
leonarski_fandClaude Opus 5
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