feat: checkpoint distributed gguf runtime stories

packages/node/native/llama/UPSTREAM_ASSUMPTIONS.md

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+# llama.cpp upstream assumptions
+
+This directory records the reproducible source dependency boundary for the
+pinned llama.cpp checkout used by the distributed GGUF runtime program.
+
+Pinned upstream commit:
+
+- `b3c9d1b846cc80a6360adb6aeaa4fcd8c4c8dcac`
+
+Pinned upstream repository:
+
+- `https://github.com/ggml-org/llama.cpp.git`
+
+Assumptions checked by the build script:
+
+- The checkout is exactly the pinned commit above.
+- The upstream source tree still ships `LICENSE`, `AUTHORS`, and
+  `CMakeLists.txt` at the repository root.
+- The project-owned worker scaffold is built from
+  `examples/meshnet-worker/`, which is introduced by the patch stack below.
+- The upstream license and attribution notices are preserved in the build
+  output by copying the root `LICENSE` and `AUTHORS` files into the worker
+  staging directory.
+
+Compatibility notes:
+
+- The current patch stack does not modify upstream llama.cpp runtime code yet.
+  It adds a project-owned worker scaffold that can be built reproducibly from
+  the pinned source checkout.
+- Later stories extend this boundary with actual llama.cpp execution patches.
+
+Failure mode:
+
+- If the checkout commit does not match the pin, the build script fails with a
+  clear pin-mismatch error before patch application or compilation starts.