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Introduce a Shadow simulation cost model for XMSS and related build/runtime switches. Adds lantern/consensus/shadow_cost.{h,c} implementing rate-based delay computation and sleep, and wires it into signature handling (src/consensus/signature.c) and client initialization so virtual-costs can be set from CLI or env vars (LANTERN_SHADOW_XMSS_*). Exposes CLI flags (--shadow-xmss-*-rate) and parsing in src/core/main.c and extends lantern_client_options. CMakeLists and cmake/Dependencies.cmake updated to include the new source and to add options (LANTERN_C_LEANVM_XMSS_JEMALLOC, LANTERN_C_LEAN_LIBP2P_AWSLC_CPU_JITTER_ENTROPY) propagated to builds; Dockerfile updated to pass those flags. Adds a shadow-specific Dockerfile and README (shadow/) and bumps the external c-leanvm-xmss submodule. These changes enable running Lantern under the Shadow simulator with controllable XMSS prover/verify/merge costs and build-time tweaks for jemalloc and AWS-LC entropy.
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