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refactor(config): single source of truth for default values across config + backend Defaults were decided in two areas with duplicated/drifted literals: the config SetDefaults tiers vs core/backend/options.go's grpcModelOpts (which translates a ModelConfig to the backend wire format and supplied its own fallbacks). They had drifted - n_gpu_layers 9999999 (options.go) vs 99999999 (gguf.go), two 512 batch constants, context 1024 (gguf) vs 4096 (backend) scattered as bare literals. Introduce core/config/defaults.go as the canonical home (DefaultContextSize=4096, GGUFFallbackContextSize=1024, DefaultNGPULayers=99999999, DefaultFlashAttention= auto). gguf.go / hooks_llamacpp.go use them directly; core/backend references them (backend imports config, never the reverse) so DefaultContextSize/DefaultBatchSize and the flash-attn / n_gpu_layers fallbacks resolve to one place. The two context values (1024 GGUF-no-estimate vs 4096 general) are kept distinct but now named + documented, not blind literals. Behavior-preserving; config + backend suites green. Assisted-by: Claude:opus-4.8 [Claude Code] Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>