docs: define implementation-ready distributed GGUF roadmap

.scratch/distributed-gguf-runtime/issues/040-add-node-side-native-worker-supervision.md

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+<!-- GENERATED FROM prd.json — DO NOT EDIT AS AN INDEPENDENT SOURCE. prd.json IS AUTHORITATIVE. -->
+# DGR-040: Add node-side native worker supervision
+
+- **Status / triage:** specification only; `ready-for-agent`; `passes: false`
+- **Execution mode:** `AFK`
+- **Milestone:** `M2`
+- **Dependencies:** `DGR-033`, `DGR-037`
+- **Blocks (derived):** `DGR-041`, `DGR-042`, `DGR-055`, `DGR-058`
+- **Labels:** `area:node`, `area:supervision`, `type:integration`, `priority:p0`, `ready-for-agent`
+- **Evidence class:** `fixture`
+- **Hardware:** `none`
+- **Model:** `generic`
+- **Upstream:** `no`
+
+## Objective / description
+
+Fresh Ralph session: read `.scratch/distributed-gguf-runtime/RALPH-CONTEXT.md`, source issue `.scratch/distributed-gguf-runtime/issues/040-add-node-side-native-worker-supervision.md`, and evidence READMEs for dependencies (DGR-033, DGR-037) before changing code. Inspect live source/tests rather than trusting legacy pass states. Objective: Let the existing node service safely start, probe, stop, and restart the standalone worker.
+
+## Acceptance criteria
+
+- [ ] Supervision owns process startup, readiness, log capture, graceful shutdown, and bounded forced termination.
+- [ ] Startup verifies worker binary, artifact identity, recipe, and range before registration.
+- [ ] Crashes or health loss make the capability unavailable without corrupting the Transformers backend.
+- [ ] Tests use the fake worker and deterministic crash injection.
+- [ ] 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-040/README.md`. Until every criterion and applicable gate has real evidence, this story remains `passes: false`. Legacy evidence is provenance only, not completion credit.