5.0.0 (2026-01-05)

refactor!: use PipeChannel instead of Channel for lock-free performance (a151677)

SignalChannel now uses PipeChannel internally instead of
Julia's built-in Channel. This provides zero-allocation performance in the
hot path but requires exactly one producer and one consumer thread.

Changes:

SignalChannel now wraps PipeChannel instead of Channel
Default buffer size changed from 0 to 16 (PipeChannel requires positive capacity)
Removed rechunk_lockfree (now redundant since rechunk is lock-free)
Removed locking methods (lock, unlock, trylock) as PipeChannel is lock-free
Updated all tests and benchmarks to use PipeChannel for generic channel tests
Added PACKAGE_VERSION support in benchmarks for version-aware testing
PipeChannel now subtypes AbstractChannel{T} for compatibility

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