<!-- GENERATED FROM prd.json — DO NOT EDIT AS AN INDEPENDENT SOURCE. prd.json IS AUTHORITATIVE. -->
# DGR-069: Prepare narrow upstream llama.cpp collaboration patches

- **Status / triage:** specification only; `ready-for-human`; `passes: false`
- **Execution mode:** `HITL`
- **Milestone:** `M5`
- **Dependencies:** `DGR-028`, `DGR-035`, `DGR-038`, `DGR-051`
- **Blocks (derived):** `DGR-071`
- **Labels:** `area:upstream`, `area:patches`, `type:collaboration`, `priority:p2`, `gate:hitl`, `ready-for-human`
- **Evidence class:** `release`
- **Hardware:** `none`
- **Model:** `generic+deepseek-v4`
- **Upstream:** `yes`

## Objective / description

Fresh Ralph session: read `.scratch/distributed-gguf-runtime/RALPH-CONTEXT.md`, source issue `.scratch/distributed-gguf-runtime/issues/069-prepare-narrow-upstream-llama-cpp-collaboration-patches.md`, and evidence READMEs for dependencies (DGR-028, DGR-035, DGR-038, DGR-051) before changing code. Inspect live source/tests rather than trusting legacy pass states. Objective: Reduce long-term patch burden through generic upstreamable hooks without asking llama.cpp to own Meshnet.

## Acceptance criteria

- [ ] Separate generic range loading, boundary I/O, and filtered state hooks from project worker/protocol code.
- [ ] Provide one scoped patch, focused test, and minimal reproducer per concern against the exact upstream pin.
- [ ] Compare the proposal with prior-art evidence and current upstream V4 support/maturity.
- [ ] Prepare human-ready design/outreach text; actual issue/PR submission remains a human action.
- [ ] 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

- Targeted deterministic tests pass; Python changes also pass `python -m compileall packages tests`.
- `git diff --check` passes.
- Default tests are model-download-free, API-credit-free, and GPU-free.
- Evidence README records exact changed files, commands/results, limitations, and dependency handoff; no fabricated evidence or inherited completion credit.
- Native changes pass focused out-of-tree CMake build and CTest; patch changes verify clean apply/check/reverse against the exact llama.cpp pin.
- Runs are opt-in and record exact artifact/split hashes, runtime/upstream pin, backend/driver, hardware, network, commands, and raw metrics. Model artifacts use configured mounted-drive storage and never `/home`.
- Preserve existing Transformers behavior and backend-agnostic Tracker routing/load balancing/billing/relay semantics unless an explicit versioned contract says otherwise. One scoped story commit is expected during execution, but this specification-materialization change is not committed.

## Evidence handoff

Write and verify `.scratch/distributed-gguf-runtime/evidence/DGR-069/README.md`. Until every criterion and applicable gate has real evidence, this story remains `passes: false`. Legacy evidence is provenance only, not completion credit.
