feat: implement DGR-006 tensor bundle boundary

.scratch/distributed-gguf-runtime/evidence/DGR-006/README.md

@@ -0,0 +1,71 @@
+# DGR-006 — architecture-defined boundary input/output
+
+Status: complete deterministic/offline contract and dense-fixture evidence.
+
+## Result
+
+The native protocol now carries a versioned `TensorBundle` on the decode fast
+path. It includes explicit architecture and boundary-point metadata. Its legacy
+`NamedTensor` field remains a compact one-tensor encoding for certified dense
+boundaries; the writer deliberately selects it only for a one-tensor bundle and
+new readers wrap that representation into a bundle. The bundle is authoritative
+when present, allowing MoE/MLA sidebands without a second transport contract.
+
+`architecture_boundary.py` is the fail-closed adapter boundary. Dense head
+Shards accept token IDs and own embedding. Middle/tail Shards accept only a
+validated bundle. Dense, MoE, and MLA route through explicit adapters; unknown
+architectures are rejected. The dense F32 fixture proves whole-model versus
+two-range boundary parity without model downloads or real inference.
+
+Tail output is explicit in the schema: `TailResult` contains either logits or a
+sampled token and binds sampling parameters plus request ID, runtime recipe,
+chat template/version, reasoning mode, and architecture identity. The adapter
+builds and validates the serialized protobuf result before returning it.
+
+## Files changed
+
+- `packages/node/native/proto/shard_runtime.proto`
+- `packages/node/meshnet_node/native_protocol/{codec.py,__init__.py,conformance.py,generated/*}`
+- `packages/node/native/testdata/decode_step_golden.binpb`
+- `packages/node/native/tests/test_shard_protocol_conformance.cpp`
+- `packages/node/meshnet_node/architecture_boundary.py`
+- `tests/test_architecture_boundary.py`
+- `tests/test_native_shard_protocol.py`
+- `packages/node/native/README.md`
+
+## Commands and results
+
+All Python commands used `/run/media/popov/d/DEV/repos/d-popov.com/AI/.venv/bin/python`.
+All native commands used `/run/media/popov/d/DEV/repos/d-popov.com/AI/.venv/bin/cmake`.
+
+```text
+python scripts/generate_native_protocol.py --check       -> passed
+python scripts/generate_protocol_goldens.py --check      -> passed
+pytest -q tests/test_architecture_boundary.py \
+  tests/test_native_shard_protocol.py tests/test_llama_cpp_dependency.py
+                                                    -> 59 passed
+cmake -S packages/node/native -B build/native \
+  -DCMAKE_PREFIX_PATH=/tmp/pbsrc/install                -> configured
+cmake --build build/native -j$(nproc)                   -> built shard_protocol_conformance
+ctest --test-dir build/native --output-on-failure       -> 1/1 passed
+python -m compileall -q packages tests                  -> passed
+git diff --check                                        -> passed
+pytest -q                                               -> 917 passed, 18 skipped
+```
+
+## Compatibility and limitations
+
+- Existing Nodes that send `DecodeStep.tensor` are accepted. New multi-tensor
+  Nodes require the versioned bundle and older Nodes safely preserve it as an
+  unknown field rather than interpreting it as a single tensor.
+- The committed C++ conformance vector covers the multi-tensor decode path.
+- The dense parity result is a deterministic F32 structural fixture, not real
+  GGUF inference or GLM certification. No real inference was run.
+- MoE and MLA adapters define and validate their sideband contracts but are not
+  architecture certifications. DGR-019 owns GLM MoE/MLA/DSA/IndexShare semantics.
+
+## Handoff
+
+DGR-007 can key its Hot KV state to the validated decoded bundle. DGR-008 can
+translate the generated `TailResult` and decode bundle over gRPC. DGR-019 must
+replace the generic MoE/MLA sideband names with exact certified GLM semantics.

.scratch/distributed-gguf-runtime/issues/06-implement-architecture-defined-boundary-input-output.md

@@ -1,6 +1,6 @@
 # 06 — Implement architecture-defined boundary input/output
 
-Status: ready-for-agent
+Status: done
 
 ## Mandatory fresh-session context
 

.scratch/distributed-gguf-runtime/prd.json

@@ -177,7 +177,7 @@
         "Update only this story issue to Status: done after every acceptance criterion and quality gate passes"
       ],
       "priority": 7,
-      "passes": false,
+      "passes": true,
       "notes": "Source issue: .scratch/distributed-gguf-runtime/issues/06-implement-architecture-defined-boundary-input-output.md",
       "dependsOn": [
         "DGR-002",