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ad4afb4d3b
The global stagesLock sync.RWMutex protected map[string]*Stage, causing all stage operations to contend on a single lock even for unrelated stages. Any stage creation or deletion blocked all reads server-wide. Replace with a typed StageMap wrapper around sync.Map which provides lock-free reads and allows concurrent writes to disjoint keys. Per-stage sync.RWMutex remains unchanged for protecting individual stage state. StageMap exposes Get, GetOrCreate, StoreIfAbsent, Store, Delete, and Range methods. Updated ~50 call sites across 6 production files and 9 test files.