Improve ARQ/LZ4 allocation efficiency and harden DNS parser limits#129

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Isusami wants to merge 3 commits intomasterking32:mainfrom

Isusami:feature/perf-reliability-tier1

Commits on Apr 12, 2026

Reduce ARQ and LZ4 allocation churn and harden DNS parser limits
Isusami
committed
Compact recently-closed heap to prevent stale entry accumulation
Isusami
committed
Restore retransmit panic recovery with error-level logging and stack trace
Isusami
committed