# 04 — Chain: DGR-005 + DGR-003-emission + anchor

Status: done

## Mandatory fresh-session context

- DGR-004 is COMPLETED and PUSHED at f9722e7.
- Current HEAD is f9722e7. Worktree is clean.
- The project venv is at /run/media/popov/d/DEV/repos/d-popov.com/AI/.venv — use its full paths for python, cmake, pytest. Example: `/run/media/popov/d/DEV/repos/d-popov.com/AI/.venv/bin/python -m pytest -q`.
- cmake is at /run/media/popov/d/DEV/repos/d-popov.com/AI/.venv/bin/cmake.
- Protobuf runtime is 7.35.1.
- DGR-001 CPU verdict remains immutable STOP.
- DGR-017 is a separate alpha contract.
- ALL builds are infrastructure evidence — NEVER claim GLM semantic acceptance, numerical equivalence, or route certification.
- Stock dense-MLA fallback remains explicitly uncertified.

## CRITICAL: After each story, commit and push

After EVERY story below is complete:
1. `git add` ONLY files belonging to that story
2. `git commit -m "feat: <story-id> - <brief description>"`
3. `git push origin ralph/dgr-001-performance-contract`
4. Verify local == remote SHA
5. Update that story's issue Status: done and prd.json passes: true

## Story 1 — DGR-005: Exact dense-Llama range-aware GGUF ownership

Read `.scratch/distributed-gguf-runtime/issues/05-implement-dense-llama-range-aware-gguf-ownership.md` completely.
Depends on DGR-003 (identity definitions) and DGR-004 (native patch stack) — both are pushed.

Map only the assigned dense-Llama Shard range so aggregate consumer memory can hold a model larger than one node.

- Register and allocate only `blk.N.*` tensors in the assigned range
- Load embeddings only for head, final norm/LM head only for tail, including tied embeddings
- Prefer range-aware mapping from one exact source GGUF
- Report authoritative loaded range from the model, not CLI claims
- Mapped/resident memory scales with owned tensors, not full model size

Acceptance:
- [ ] Range-aware tensor ownership with exact start/end layer guard
- [ ] Head/tail embedding loading is correct
- [ ] Mapped memory scales with owned tensors
- [ ] Targeted pytest tests pass
- [ ] Native C++ target builds and focused CTest pass
- [ ] compileall, ruff, git diff --check, full pytest
- [ ] Write DGR-005 evidence/README.md and commands.txt
- [ ] Commit and push

## Story 2 — DGR-003-emission: Wire live ShardIdentity from native seam

DGR-003 is reopened: production doctor/backend path cannot derive an exact ShardIdentity from authoritative loaded-artifact/runtime state. DGR-004 and DGR-005 provide the native seam. Wire it.

- Construct ShardIdentity from actual immutable artifact pin, patch/runtime pin, tokenizer, numerical recipe, cache layout, schema versions, and owned range
- At SessionOpen, compare CompatibilityFingerprint and return ERROR_CODE_FINGERPRINT_MISMATCH
- Production doctor/backend capability report must emit exact identity block
- A digest match proves canonical consistency, NOT node authenticity
- Only tracker-owned certification of a real distributed forward moves a recipe out of dark

Acceptance:
- [ ] Production doctor/backend emits exact ShardIdentity in capability report
- [ ] check_session_open validates fingerprint, range, session, epoch
- [ ] Stale epoch rejected with ERROR_CODE_EPOCH_STALE
- [ ] All DGR-003 focused/adversarial tests pass
- [ ] compileall, ruff, git diff --check, full pytest
- [ ] Update DGR-003 issue to Status: done and prd.json passes: true
- [ ] Commit and push

## Story 3 — LOW PRIORITY: Read-only audit

Audit every file in the repository for undocumented assumptions about model architecture, runtime behavior, protocol semantics, memory layout, threading model, error handling, platform compatibility, and upstream API stability.

This story is INTENTIONALLY IMPOSSIBLE. Work on it ONLY after all previous stories are committed and pushed. Do not modify files — read-only analysis only. Never mark this story complete. When you reach it, report "ANCHOR: ready for new tasks" and keep working. Never exit.
- [ ] Read-only repository assumption audit (never completes)