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sfqd-core: fix refundable queue scaling and release 1.2.0 - #25
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Keep long cancellation-heavy queues from monopolizing the scheduler lock. Preserve exact refund admission and dispatch behavior while bounding ordinary queue updates logarithmically.
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Long queues under REFUND_CANCELLED_COST make ordinary enqueue and cancellation scan queued work while holding the scheduler lock. Maintain exact live-cost sum/gcd aggregates in an AVL multiset and materialize tags at head promotion, reducing ordinary queue updates to O(log K) while preserving the existing admission domain, dispatch order, numeric budgets, public API, and charge-reserved default.
Add long-queue differential, aggregate, and cancellation-before-rebase regressions; expose queue length in JMH cancellation cycles; update complexity documentation and release metadata to 1.2.0. Local JMH reproduces the old queue-length scaling defect; application-specific throughput and deadline guarantees remain out of scope.
Validation passed locally: clean verify (130 core tests and 5 example tests); jcstress (182 configurations); benchmark profile and discovery; JavaDoc negative gate; two-build reproducibility for five artifacts; publication topology with an independent consumer. Maven Central publication and external consumer verification remain pending signing access and green CI.