# UD session activity record — 16–17 October 2026

This index records the full accessible session: 17 recovered earlier packages plus nine later immutable captures. All are constructor-side development records. Physical promotion remains **0**; independent review is **not established**. A successful computation or completed task does not promote a physical bridge.

## Earlier work recovered intact

The original transient checkout is unavailable. These exact archives preserve reports, code, data and source receipts. ZIP CRC and all original manifest entries were checked during this publication; the scientific calculations were not rerun. Original commit references inside archives are provenance records, not reconstructed Git ancestors.

| Activity package | Read report | Download exact archive |
|---|---|---|
| 37 INSTRUMENT ERROR CONTRACT | [report](reports/UD_37_INSTRUMENT_ERROR_CONTRACT_v0.1/UD_37_INSTRUMENT_ERROR_CONTRACT_v0.1.md) | [ZIP](recovered/UD_37_INSTRUMENT_ERROR_CONTRACT_v0.1.zip) |
| 37 PREPARATION CERTIFICATE | [report](reports/UD_37_PREPARATION_CERTIFICATE_v0.1/UD_37_PREPARATION_CERTIFICATE_v0.1.md) | [ZIP](recovered/UD_37_PREPARATION_CERTIFICATE_v0.1.zip) |
| 600CELL VERTEX LINK OBSERVABILITY | [report](reports/UD_600CELL_VERTEX_LINK_OBSERVABILITY_v0.1/UD_600CELL_VERTEX_LINK_OBSERVABILITY_v0.1.md) | [ZIP](recovered/UD_600CELL_VERTEX_LINK_OBSERVABILITY_v0.1.zip) |
| BOUNDARY COFRAME MOD13 | [report](reports/UD_BOUNDARY_COFRAME_MOD13_v0.1/UD_BOUNDARY_COFRAME_MOD13_THEOREMS_v0.1.md) | [ZIP](recovered/UD_BOUNDARY_COFRAME_MOD13_v0.1.zip) |
| COMPRESSED LOCAL VALIDATION | [report](reports/UD_COMPRESSED_LOCAL_VALIDATION_v0.1/UD_COMPRESSED_LOCAL_VALIDATION_v0.1.md) | [ZIP](recovered/UD_COMPRESSED_LOCAL_VALIDATION_v0.1.zip) |
| DEGREE12 COMPATIBILITY | [report](reports/UD_DEGREE12_COMPATIBILITY_v0.1/UD_DEGREE12_COMPATIBILITY_v0.1.md) | [ZIP](recovered/UD_DEGREE12_COMPATIBILITY_v0.1.zip) |
| FINITE SIX RATIO CALIBRATION | [report](reports/UD_FINITE_SIX_RATIO_CALIBRATION_v0.1/UD_FINITE_SIX_RATIO_CALIBRATION_v0.1.md) | [ZIP](recovered/UD_FINITE_SIX_RATIO_CALIBRATION_v0.1.zip) |
| FITTED GENERATOR CERTIFICATE | [report](reports/UD_FITTED_GENERATOR_CERTIFICATE_v0.1/UD_FITTED_GENERATOR_CERTIFICATE_v0.1.md) | [ZIP](recovered/UD_FITTED_GENERATOR_CERTIFICATE_v0.1.zip) |
| FULL STATE THIRD SHELL OBSERVABILITY | [report](reports/UD_FULL_STATE_THIRD_SHELL_OBSERVABILITY_v0.1/UD_FULL_STATE_THIRD_SHELL_OBSERVABILITY_v0.1.md) | [ZIP](recovered/UD_FULL_STATE_THIRD_SHELL_OBSERVABILITY_v0.1.zip) |
| GRADE METRIC GAIN CALIBRATION | [report](reports/UD_GRADE_METRIC_GAIN_CALIBRATION_v0.1/UD_GRADE_METRIC_GAIN_CALIBRATION_v0.1.md) | [ZIP](recovered/UD_GRADE_METRIC_GAIN_CALIBRATION_v0.1.zip) |
| HANKEL EXCITATION AUDIT | [report](reports/UD_HANKEL_EXCITATION_AUDIT_v0.1/UD_HANKEL_EXCITATION_AUDIT_v0.1.md) | [ZIP](recovered/UD_HANKEL_EXCITATION_AUDIT_v0.1.zip) |
| HELD OUT DISCREPANCY CONTRACT | [report](reports/UD_HELD_OUT_DISCREPANCY_CONTRACT_v0.1/UD_HELD_OUT_DISCREPANCY_CONTRACT_v0.1.md) | [ZIP](recovered/UD_HELD_OUT_DISCREPANCY_CONTRACT_v0.1.zip) |
| HELD OUT VALIDATION | [report](reports/UD_HELD_OUT_VALIDATION_v0.1/UD_HELD_OUT_VALIDATION_v0.1.md) | [ZIP](recovered/UD_HELD_OUT_VALIDATION_v0.1.zip) |
| IDENTIFIABLE CALIBRATION | [report](reports/UD_IDENTIFIABLE_CALIBRATION_v0.1/UD_IDENTIFIABLE_CALIBRATION_v0.1.md) | [ZIP](recovered/UD_IDENTIFIABLE_CALIBRATION_v0.1.zip) |
| OBSERVER ROBUSTNESS | [report](reports/UD_OBSERVER_ROBUSTNESS_v0.1/UD_OBSERVER_ROBUSTNESS_v0.1.md) | [ZIP](recovered/UD_OBSERVER_ROBUSTNESS_v0.1.zip) |
| PARALLEL WORK RECONCILIATION | [report](reports/UD_PARALLEL_WORK_RECONCILIATION_v0.1/UD_PARALLEL_WORK_RECONCILIATION_v0.1.md) | [ZIP](recovered/UD_PARALLEL_WORK_RECONCILIATION_v0.1.zip) |
| TWO SHELL TETRAHEDRAL OBSERVABILITY | [report](reports/UD_TWO_SHELL_TETRAHEDRAL_OBSERVABILITY_v0.1/UD_TWO_SHELL_TETRAHEDRAL_OBSERVABILITY_v0.1.md) | [ZIP](recovered/UD_TWO_SHELL_TETRAHEDRAL_OBSERVABILITY_v0.1.zip) |

## Later work published as original commits

| Commit | Activity | Capture |
|---|---|---|
| `ec303ab` | Certify restricted local fault detection and history operator bounds | [evidence](../2026-10-17T140202Z-codex-restricted-fault-history-e21f46fc/MANIFEST.json) |
| `610c487` | Optimize restricted validation precision and measurement-count frontier | [evidence](../2026-10-17T142835Z-codex-validation-tradeoff-da0fdb89/MANIFEST.json) |
| `36ef6e1` | Derive finite-sample noise versus retained-signal frontier | [evidence](../2026-10-17T144006Z-codex-noise-retention-1824b625/MANIFEST.json) |
| `9c287ea` | Freeze conditional primary acquisition and review contract | [evidence](../2026-10-17T145236Z-codex-acquisition-freeze-ceda2dba/MANIFEST.json) |
| `6e4bbfb` | Certify storage-limited Hankel spectra and audit parallel monitoring claims | [evidence](../2026-10-17T152126Z-codex-spectral-extraction-3ffbbcbf/MANIFEST.json) |
| `89eef7d` | Benchmark frozen nominal Hankel pipeline with verified factor Grams | [evidence](../2026-10-17T165137Z-codex-nominal-benchmark-b80f21bf/MANIFEST.json) |
| `9672289` | Certify record-only Hankel extraction and full-size perturbation controls | [evidence](../2026-10-17T173305Z-codex-record-only-spectrum-fc6e3b97/MANIFEST.json) |
| `15fd28a` | Certify noisy record proposals and prepare independent review packet | [evidence](../2026-10-17T181003Z-codex-noisy-proposal-6371dfe9/MANIFEST.json) |
| `6136b5c` | Audit supplied review attestations and hold unbound review claims | [evidence](../2026-10-17T182704Z-codex-review-intake-b8630c6a/MANIFEST.json) |

## Outcomes and corrections

- The 600-cell boundary is a closed 3-sphere; an icosahedral vertex link is a selected 2-sphere, not its manifold boundary. Coframe alignment alone cannot recover an arbitrary projection kernel. Nilpotency does not force torsion flatness. The mod-13 and group-theoretic corrections remain in the boundary/coframe audit.
- For the declared unit-metric real generator, one 62-channel link has snapshot rank 62, history rank 1893 and unobservable dimension 747. Isolated C10 sectors have snapshot rank 51 and history ranks 255 (m=0), 220 (m=5), 254 (m=1,3,7,9), 258 (m=2,4,6,8); these do not sum to global rank because the observer is not equivariant.
- A second link plus one tetrahedral readout gives 125 channels, history rank 2498 and hidden dimension 142: a reduction of 605 from the original kernel. Its finite 8192-sample protocol at step 1/2 has condition bound <1183 on the observable subspace. The later three-link observer with the retained tetrahedron and three extra simplex ports has 189 channels, history rank 2640 and zero dynamical kernel; its 8192-sample condition bound is <296 (2048 samples: <725). These are distinct observer configurations, not reconstruction from the original single shell.
- Finite-field arithmetic is separate from real conditioning. The cubic x^3−2, quartic cyclotomic anchor and degree-12 compositum are exact algebra; Frobenius order does not fix Pachner period. A single free trajectory has at most 105 temporal directions here; merely adding Hankel columns cannot excite all 1893. The explicit 37-preparation design supplies the required modal excitation.
- Six-ratio calibration meets the conditional 2^-39 gate under its declared bounded error contract. Fitted metric/rate/gain and clock ambiguities, held-out discrepancy, restricted fault detection and precision/measurement tradeoffs have separate typed certificates. No apparatus calibration or synthetic-self-prediction endorsement is asserted.
- The primary acquisition freeze uses 37 preparations, M=4096 and 62 history channels: 18,790,154 readings. These history channels are distinct from 189 diagnostic outputs and additional calibration ports. The original nominal 747-dimensional dynamical kernel remains invisible to that observer.
- Exact Hankel actions, energy accounting, factor Grams and projection residual bounds avoid the dense 286.75-GiB matrix. The nominal run encloses condition <706.570; the record-only verifier bounds the complete projection tail <1.132e-12. Four full-size noisy cases retain 1893 singular values above the frozen threshold with condition enclosures below 2029.
- The temporal discovery gap theorem does not prove universal fitting convergence. Threshold count is not exact algebraic rank: a weak impulse fixture has rank at least 2203 while the retained count stays 1893. The codec recovers a finite recorded history, not hidden bulk state or a unique continuous-time generator.
- Review intake remains HOLD: each supplied manifest mismatches all 12 existing target files; reviewer attribution/independence and original review-file bytes are absent. A different revision is possible. The audit preserves submissions and prior numerical certificates; no endorsement or intent is inferred.

## Tracking and remaining returns

| Item | Operational disposition | Remaining gate |
|---|---|---|
| [#176](https://github.com/ud-tetra/UD/issues/176) | Completed computational record; repository publication in review | Task completion only |
| [#177](https://github.com/ud-tetra/UD/issues/177) | Blocked / review HOLD | Attributable, hash-bound corrected independent return |
| [#178](https://github.com/ud-tetra/UD/issues/178) | Ready development work | Broader noisy fitting and declared failure domain |
| [#136](https://github.com/ud-tetra/UD/issues/136) | Open | Native metric and observer selection |
| [#144](https://github.com/ud-tetra/UD/issues/144) | Open | Joint acquisition/metrology, timing, dependence and costs |
| [#130](https://github.com/ud-tetra/UD/issues/130) | Open | Independent replay with pinned inputs and negative controls |

Project: [Unified Dynamics](https://github.com/users/ud-tetra/projects/1/). No assignee, deadline, CRL advancement or independent review acceptance is inferred.

## Coverage limits

All 26 accessible generated research packages/captures are indexed above. This is an artifact/activity record, not a verbatim transcript or hidden model-state export. The unavailable Gap2_FINAL_Finite_Genesis.png and private source text excluded by its earlier package were not recovered. Corrections are preserved with their targets; unsupported pasted workstream claims do not become accepted results. Earlier local-only receipts retain their original bytes and timestamped meanings; this capture records subsequent publication authorization.