nx_choker.nx

nx_choker.nx -- BitTorrent choke algorithm: tit-for-tat + optimistic unchoke (deterministic). module: nishi-core.torrent.choker depends: nx_syscalls.nx capability: CORE_COMPUTE wired_status: FULLY_WIRED "Better download rates" earned the way the protocol intends: reciprocity. We give upload slots to the peers who feed US fastest (tit-for-tat) so they keep US unchoked, plus one rotating optimistic slot to discover new fast peers and bootstrap newcomers. Mainline rotates the optimistic slot RANDOMLY every ~3 rounds; we rotate it ROUND-ROBIN by a deterministic round counter instead -- same discovery behavior, but the whole choke schedule stays bit-for-bit replayable (the determinism exceed thesis; no client in the field can replay its own choke decisions). Pure selection over caller-owned arrays: no wall clock, no RNG, no syscalls on the decision path.