R12 SD-CST Joint Renderer-Memory Program Decoder Preregistration

Status: closed and rejected by the sole valid training-only H100 run; no scored split was opened

Result: exact source 102ab3f5172e9a6c86d1045d61c0e1ce66f159e2, seed 6795424534800881443, and job 694099 completed the frozen 3,000-update contract on H100 evc36. Fit and held-out line pointers, event pointers, tapes, and packets are all 0%. See R12_SD_CST_RENDERER_NATIVE_JOINT_RESULT.md.

Parent: exact rejected Renderer-Orbit v1.2 checkpoint

Claim class: favorable joint conventional compiler control on consumed training rows; no primitive novelty or reasoning claim

1. Fixed diagnosis

The head-only renderer-native decoder in job 694073 preserves v1.2 exactly but learns 0% fit line/event pointers and packets. Its line loss stays near uniform and kind loss stays near chance. This means the frozen orbit memory does not expose program structure in a form the new decoder can use. More decoder epochs are forbidden.

The smallest next control co-adapts shared renderer memory and the decoder. It does not alter the categorical tape or executor and adds no parameters beyond the rejected head-only model.

2. Trainability and resources

Initialization is the exact v1.2 checkpoint SHA 2e019b81...; native decoder parameters are freshly initialized under the post-commit seed. Trainable names are exactly:

• all 35 native_* decoder parameters;
• orbit byte and position embeddings;
• all eight orbit encoder layers; and
• orbit final normalization.

The residual projection and scalar gate, ordinal query/pointer/value motors, all binding machinery, exact packet heads, categorical executor, motor, reader, and Shohin trunk remain frozen. Query, binding, initial, and packet losses still backpropagate through shared memory, providing preservation constraints.

An exact loaded-parent consumed-row backward pass has finite gradients in the shared encoder and native decoder, no gradient in the frozen ordinal motor, and a frozen-state digest over every excluded tensor.

3. Data and optimization

The pilot reuses the already-consumed 12,000-even / 2,000-odd renderer orbit. This is adaptive mechanism development, not a fresh generalization result. No development, confirmation, answer, state, or trajectory is reachable.

Optimization remains two epochs / 3,000 updates, family batch eight, AdamW lr 2e-4, betas (0.9, 0.95), weight decay 0.01, 100-step warmup, cosine decay, clip 1.0, and renderer consistency weight 1.0. Event address/identity loss uses the already-frozen support-safe curriculum; final fit event pointers must reach 99%.

4. Gates

Every held-out renderer must reach:

1. initial state at least 95%;
2. complete kind at least 95%;
3. complete active identity at least 90%;
4. complete active amount at least 95%;
5. query and query pointer each at least 99%;
6. declaration and initial-occurrence pointers each at least 99%;
7. source-line pointers at least 95%;
8. event-occurrence pointers at least 90%;
9. complete packet at least 80%; and
10. every fit renderer event pointer at least 99%.

The frozen excluded-state digest must match, complete parameters must remain strictly below 200M, and scored access must be 0/0. No threshold or epoch may change after output.

5. Honest boundary

Joint encoder/decoder training is ordinary representation learning. It is a favorable conventional parser control under the R12 invention charter, not a new reasoning primitive. A pass only establishes that the finite renderer orbit is learnable under the parameter cap and permits this exact architecture as a baseline in a separately committed fresh-board experiment. A failure closes joint co-adaptation without a larger/longer retry.