# 19 — Implement and certify GLM-5.2 range, DSA, and IndexShare semantics

Status: ready-for-agent

## Mandatory fresh-session context

- Read [RALPH-CONTEXT.md](../RALPH-CONTEXT.md), [GLM-5.2-MAX-ALPHA-ROADMAP.md](../GLM-5.2-MAX-ALPHA-ROADMAP.md), and this issue completely before changing code.
- This issue is `DGR-019` in [prd.json](../prd.json).
- Read and verify every dependency evidence README.
- Inspect current source and `git status`; do not generalize through tensor-name substitution.

## Description

As a target-model operator, I need explicit range-owned GLM-5.2 semantics so that contiguous consumer Shards preserve the whole-model MoE, DSA, IndexShare, and local-KV computation.

## Expected durable outputs

- Explicit GLM-5.2 architecture adapter and tensor-ownership rules
- IndexShare-aware Shard planner and named DSA sideband protocol mapping
- GLM architecture fixture and target parity evidence
- Memory/tensor/KV ownership report
- `evidence/DGR-019/README.md`

## Acceptance criteria

- [ ] Implement explicit ownership for 78 main layers, head embedding, tail norm/output head, routed/shared experts, DSA/indexer tensors, and the certified NextN/MTP policy.
- [ ] Each contiguous layer owner keeps all 256 experts and the shared-expert path for its layers local; no public cross-machine expert collectives are introduced.
- [ ] Define and fixture-test compressed MLA KV ownership for locally owned layers, keyed by Route Session/epoch, for DGR-007 to implement.
- [ ] Implement native DSA lightning indexer/top-2,048 and sparse-attention graph behavior matching DGR-018.
- [ ] Parse and validate artifact `indexer_types`; implement Full producer and Shared consumer behavior without fabricated/duplicated indexer tensors.
- [ ] Prefer Shard boundaries that preserve IndexShare ownership groups; when memory fit forces a split, carry a typed, bounded, validated top-k sideband in the DGR-006 named bundle.
- [ ] Reject missing, stale, wrong-width, wrong-position, or Shared-before-Full sideband/index state.
- [ ] Demonstrate mapped/resident weights and allocated KV scale with exact owned tensors/layers rather than the full model.
- [ ] Same-host two-stage F32 seam fixture produces 32 exact greedy tokens against the DGR-018 semantics; production seam meets the pre-locked token/similarity thresholds.
- [ ] If full-target same-host execution cannot fit, use a layer-reduced GLM architecture fixture only for graph parity and defer full-artifact parity to DGR-020; label it non-target evidence.
- [ ] Add deterministic fixture tests for MoE route/shared expert, DSA Full/Shared groups, internal group split, endpoint ownership, KV filtering, malformed metadata, and NextN policy.
- [ ] Targeted pytest/CTest/native tests pass; pinned patch stack applies and rebuilds cleanly.
- [ ] `python -m compileall packages tests` and `git diff --check` pass.
- [ ] Default tests remain deterministic, model-download-free, API-credit-free, and GPU-free.
- [ ] Full deterministic `pytest -q` passes, or exact pre-existing unrelated failures are recorded.
- [ ] Preserve all pre-existing working-tree changes and stage only files belonging to this story.
- [ ] Write `evidence/DGR-019/README.md` with files, commands, real results, raw evidence, limitations, and dependent-story handoff.
- [ ] Update only this story issue to `Status: done` after every acceptance criterion passes.

## Dependency handoff

- `DGR-005`, `DGR-006`, and `DGR-018` must have `passes: true`; read and verify their evidence READMEs.
- DGR-007 integration may be completed in parallel only after the adapter's cache contract is explicit.

## Finish contract

- Preserve real failures and blockers; never claim target parity from the architecture fixture.
- Emit `<promise>COMPLETE</promise>` only after evidence exists.

## References

- [GLM-5.2 Max alpha roadmap](../GLM-5.2-MAX-ALPHA-ROADMAP.md)
- [Current architecture](../architecture.md)