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Perf/sharded handoff queue - #110
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Replace the single taskQueue channel with N power-of-two shard channels so a large worker count no longer serialises on one channel lock. Producers round-robin across shards via a lock-free atomic cursor; workers scan shards from a per-worker cursor and only fall back to the chunked overflow buffer when every shard is empty, dropping the old double non-blocking poll. Shard count defaults to next-power-of-two(min(GOMAXPROCS,32)) for queues of at least 1024 slots, single-channel below that; each shard gets at least one slot so total capacity never shrinks. Adds WithTaskQueueShards(n); GetTaskQueueLen sums shards and GetTaskQueueCapacity reports the configured total. Measured on 20 cores, capacity 20000, queue 100000: hand-off throughput about 2.4x, CPU per hand-off about 2.4x lower, procyield -82 percent. Execution-bound 10ms tasks: +12-18 percent at high concurrency, no regression at low concurrency. Note: task execution order is not guaranteed.
Add invariant-based concurrency stress tests for the sharded handoff queue: no task loss or duplication, no deadlock across shard/queue/capacity combinations, nonblock accept accounting, reentrant submission, graceful shutdown, panic isolation and ctx cancellation, plus a 300k-task heavy run. Add benchmark/scaling_matrix_test.go (worker-count x load matrix, implementation agnostic) and benchmark/ants_compare_test.go (CPU and hand-off comparison against panjf2000/ants v2, added as a test-only dependency).
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