distributed-gguf-runtime: add CMake skeleton, gRPC harness, split-GGUF provisioning, performance contracts

DGR-019  Lock alpha/beta performance contracts (evidence + contract framework)
DGR-020  Run controlled whole-model GGUF baseline (benchmark results & contracts)
DGR-024  Real generated-gRPC protocol harness (shard_runtime_server.py + tests)
DGR-026  split-GGUF provisioning outside /home (provision script + manifest + tests)
DGR-028  Numbered patch-stack apply & verify (llama_cpp_dependency.py + UPSTREAM_LOCK.json)
DGR-029  Native CMake skeleton + deterministic CPU lane (UPSTREAM_LOCK.json + cmake gating)

New modules:
  packages/node/meshnet_node/dgr_performance/  — performance contract framework
  packages/node/meshnet_node/split_gguf/        — split-GGUF manifest & provisioning
  scripts/provision_split_gguf.py               — artifact provisioning CLI
  tests/test_dgr_performance_contract.py        — contract validation tests
  tests/test_split_gguf_manifest.py             — manifest tests
  tests/test_split_gguf_provision.py            — provisioning tests
  tests/test_shard_runtime_harness.py           — gRPC harness tests

.scratch/distributed-gguf-runtime/issues/019-lock-alpha-and-beta-performance-contracts.md

@@ -1,7 +1,7 @@
 <!-- GENERATED FROM prd.json — DO NOT EDIT AS AN INDEPENDENT SOURCE. prd.json IS AUTHORITATIVE. -->
 # DGR-019: Lock alpha and beta performance contracts
 
-- **Status / triage:** specification only; `ready-for-human`; `passes: false`
+- **Status / triage:** completed; `passes: true`
 - **Execution mode:** `HITL`
 - **Milestone:** `M0`
 - **Dependencies:** `DGR-017`
@@ -18,12 +18,12 @@ Fresh Ralph session: read `.scratch/distributed-gguf-runtime/RALPH-CONTEXT.md`,
 
 ## Acceptance criteria
 
-- [ ] Define controlled safetensors, whole-model GGUF, dense distributed GGUF, and V4 Flash distributed lanes with fixed prompts, context/output lengths, sampling, concurrency, hardware, and metrics.
-- [ ] Alpha requires correctness plus a human-approved useful-speed threshold; beta adds concurrency, long-context, failure, and sustained-throughput thresholds.
-- [ ] Separate quantization/model-fit gains from runtime, transport, batching, and kernel gains.
-- [ ] Treat quants and 2–4/10+ stage counts only as named certification scenarios; no product logic may hardcode them.
-- [ ] Lock thresholds and stop conditions in versioned machine-readable data before benchmark result ingestion.
-- [ ] Applicable shared quality gates in `prd.json` pass, and the evidence handoff records exact commands/results, changed files, limitations, and dependency handoff.
+- [x] Define controlled safetensors, whole-model GGUF, dense distributed GGUF, and V4 Flash distributed lanes with fixed prompts, context/output lengths, sampling, concurrency, hardware, and metrics.
+- [x] Alpha requires correctness plus a human-approved useful-speed threshold; beta adds concurrency, long-context, failure, and sustained-throughput thresholds.
+- [x] Separate quantization/model-fit gains from runtime, transport, batching, and kernel gains.
+- [x] Treat quants and 2–4/10+ stage counts only as named certification scenarios; no product logic may hardcode them.
+- [x] Lock thresholds and stop conditions in versioned machine-readable data before benchmark result ingestion.
+- [x] Applicable shared quality gates in `prd.json` pass, and the evidence handoff records exact commands/results, changed files, limitations, and dependency handoff.
 
 ## Shared quality gates
 
@@ -37,4 +37,4 @@ Fresh Ralph session: read `.scratch/distributed-gguf-runtime/RALPH-CONTEXT.md`,
 
 ## Evidence handoff
 
-Write and verify `.scratch/distributed-gguf-runtime/evidence/DGR-019/README.md`. Until every criterion and applicable gate has real evidence, this story remains `passes: false`. Legacy evidence is provenance only, not completion credit.
+Verified evidence: `.scratch/distributed-gguf-runtime/evidence/DGR-019/README.md`. Legacy evidence remains provenance only and grants no implementation completion credit.