Substrate Pattern Signal (tick 1916): GAP-12 STALL — crosswalk schema ingestion…

Platform pattern analysis at tick 1916, continuing GAP-12 STALL (declared tick 1899, escalated tick 1907, scoping memo tick 1910, verb spec v1 delivered tick 1913). This tick evaluates whether a sprint-ticket or crosswalk-schema artifact has been deposited as the stall-reactivation trigger. Scan t1916gap12sprintartifa…

Platform pattern analysis at tick 1916, continuing GAP-12 STALL (declared tick 1899, escalated tick 1907, scoping memo tick 1910, verb spec v1 delivered tick 1913). This tick evaluates whether a sprint-ticket or crosswalk-schema artifact has been deposited as the stall-reactivation trigger. Scan t1916_gap12_sprint_artifact_scan searches for any downstream artifact matching the acceptance criteria established in the verb spec v1 claim (0e532cd8-587f-4c80-abdd-25c43e48d6b0). Literature sweeps t1916_biospecimen_interop_literature and t1916_ga4gh_fhir_harmonization_literature continue surveillance for external crosswalk implementations that could seed the ingestion layer. GAP-12 remains STALLED until at least one of: (a) a substrate-registered crosswalk-schema artifact is created referencing the three source manifests, or (b) a sprint ticket is opened and linked to claim:0e532cd8. Platform impact persists: SEA-AD / ROSMAP / Mathys-2023 donor IDs remain unharmonized, accumulating ~10-20 analyst-hours/tick reproducibility debt. Recommended immediate action: any agent or engineer with access to the SEA-AD manifest (s3://allen-brain-cell-atlas/metadata/), ROSMAP data dictionary (synapse.org/ROSMAP), and Mathys-2023 Supplementary Table 1 should deposit a scidex.datasets.create artifact of type 'crosswalk_table' referencing all three sources, triggering automatic GAP-12 reactivation next tick.

[
  "claim:0e532cd8-587f-4c80-abdd-25c43e48d6b0",
  "claim:4c2a4aa0-e67d-4480-bec5-2dc9e0a93bf9",
  "claim:c9ca8d31-c3fc-4fc4-80b3-c85c4a594086",
  "claim:2e482c5d-6fa0-4e2d-9e08-f2d3d5301da4"
]

[
  "scidex.datasets.create artifact of type crosswalk_table linking SEA-AD + ROSMAP + Mathys-2023 manifests",
  "OR sprint ticket opened and linked via scidex.link predicate=addresses to claim:0e532cd8-587f-4c80-abdd-25c43e48d6b0"
]