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Synapse architecture

Synapse is a local-first inference engine whose product code is owned in this monorepo. C# owns the public SDK, typed IRs, portable/reference execution, orchestration, policy, diagnostics, durable metadata adapters, and the first implementation of every path. Rust takes optimized kernels, allocators, hot-KV operations, and direct transfer only when a paired profile proves that boundary is necessary. The portable C# path remains executable and tested.

.NET SDK / CLI / Host
        |
        +-- in-process local graph runtime (no Orleans/network)
        |
        +-- Orleans request/control plane (planned D3)
                   | leases, epochs, region/weight-group placement
                   v
          graph worker ===== direct bounded data ===== graph worker
                   |
                   +-- verified Model IR -> Execution IR
                   +-- C# portable/reference kernels and KV semantics
                   +-- profiled Rust/native kernels, allocator, hot KV, transfer

ZoneTree (embedded, C#)
        +-- package/cache metadata
        +-- prefix index and state journal
        +-- benchmark/evidence catalog

Orleans (later D3 request/control plane only)
        +-- accepts/co-ordinates distributed requests
        +-- leases, placement, weight groups, epochs, and recovery

The central FlyBrain execution model is a bounded activation wave over coarse regions. Model IR answers what may execute; Execution IR decides how and with which precision; the deployment plan decides where. Region labels are annotations only. A skippable region declares a graph decision or profile, its structural/programmed/trained/approximate provenance, and explicit absent or bypassed output behavior. See docs/ADR/ADR-002-flybrain-activation-waves.md.

Large tensors, activations, and KV payloads never transit Orleans. There is no grain per token, layer, node, or neuron. Local execution never requires Orleans, a coordination server, or a network. Unsupported models, operators, profiles, or devices fail before generation with structured errors.

External comparison boundary

dotLLM, LLamaSharp, and direct llama.cpp are launched as separate benchmark subjects. They are not product backends and cannot satisfy Synapse correctness tests. Every comparison records its exact commit/package/native-binary fingerprint and uses the same compatible model inputs. MLX and ONNX Runtime GenAI are candidate external subjects only in qualified hardware/weight-format cohorts. dotLLM source is GPL-3.0 and is not copied into this MIT repository.

Initial vertical slice

The bootstrap doctor proves the installed .NET/Rust toolchains, current CPU architecture and SIMD capability, memory budget validation, a real Rust child process, and a durable ZoneTree write/reopen/read. The first inference slice adds a bounded GGUF v3 reader, a verified 26-region Qwen2 Model IR, and a managed Qwen2 Q8_0 forward/decode path. Text enters through a repo-owned byte-level BPE tokenizer read from the GGUF vocabulary (ADR-014), qualified by whole-corpus parity with llama-tokenize. The first scalar reference operators and a fixed-shape dense tiny-graph interpreter are covered by FP64 and fail-closed tests. Qwen execution from the IR, paged KV, and the Orleans topology remain on the critical path. GPU execution (ADR-012) runs a brand-neutral dense-decoder layout through native/synapse-gpu: Metal is implemented and tested on Apple silicon; CUDA shares the same step encoder and ABI but has not run on NVIDIA hardware. Context limits and explicit YaRN scaling are ADR-013. Quality is measured by teacher-forced scoring on every backend (perplexity with the llama-perplexity protocol) and by exact-answer long-context tasks, with every engine given identical tokens (ADR-015). Model acquisition and import boundaries are in ADR-004 and docs/Features/ModelPackages.md.