test: real-world config corpus and production-pattern runtime tests

tests/fixtures/realworld/README.md

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+# Real-world config fixtures
+
+Production configurations vendored from sibling repositories. In every file each
+`local:` value was rewritten to `local: payload.placeholder` (validation never reads
+payloads); everything else is byte-identical to the source.
+
+## positive/
+
+| File | Source repo | Original path |
+|---|---|---|
+| `mokg-v12/AYOGLU1.v12.yaml` | MultiomicsNext | `.tablassert/mokg-v12/AYOGLU1.v12.yaml` |
+| `mokg-v12/CORREIA3.v12.yaml` | MultiomicsNext | `.tablassert/mokg-v12/CORREIA3.v12.yaml` |
+| `mokg-v12/HOYER1.v12.yaml` | MultiomicsNext | `.tablassert/mokg-v12/HOYER1.v12.yaml` |
+| `refconfigs/AYOGLU1.yaml` | MultiomicsNext | `.tablassert/refconfigs/AYOGLU1.yaml` |
+| `dakp/approved_treats.yaml` | DAKP | `tables/approved_treats.yaml` |
+| `dakp/contraindications.yaml` | DAKP | `tables/contraindications.yaml` |
+| `dakp/faers_applied_to_treat.yaml` | DAKP | `tables/faers_applied_to_treat.yaml` |
+| `dakp/graph.yaml` | DAKP | `tables/graph.yaml` |
+| `tableconfigs/AAMER1.yaml` | TableConfigs | `TABLE/FLAKASSIST/AAMER1.yaml` |
+| `tableconfigs/ALAM1.yaml` | TableConfigs | `TABLE/MBKG/ALAM1.yaml` |
+| `tableconfigs/SILVARODRGUEZ3.yaml` | TableConfigs | `TABLE/FLAKASSIST/SILVARODRGUEZ3.yaml` |
+| `tableconfigs/BRUNDAGE5.yaml` | TableConfigs | `TABLE/FLAKASSIST/BRUNDAGE5.yaml` |
+
+## negative/ (deliberate legacy configs; 12.x must reject them)
+
+| File | Source repo | Original path | Why rejected |
+|---|---|---|---|
+| `DRUGIBD.yaml` | TableConfigs | `TABLE/QI/DRUGIBD.yaml` | legacy keys `syntax: TC3`, `status: alpha`, `provenance.contributors` |
+| `MOKG.yaml` | TableConfigs | `GRAPH/MOKG.yaml` | legacy graph layout: no `rig:`, top-level `description:` |

tests/fixtures/realworld/negative/DRUGIBD.yaml

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+template:
+  syntax: TC3
+  status: alpha
+  source:
+    kind: excel
+    local: payload.placeholder
+    url: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9439210/bin/pone.0273612.s002.xlsx
+    sheet: Biological Therapy
+    row_slice:
+      - 1
+      - auto
+  statement:
+    subject:
+      method: column
+      encoding: D
+      prioritize:
+        - ChemicalEntity
+      taxon: 9606
+    predicate: treats
+    object:
+      method: column
+      encoding: A
+      prioritize:
+        - Disease
+      regex:
+        - pattern: "^CD$"
+          replacement: "MONDO:0005011"
+        - pattern: "^UC$"
+          replacement: "MONDO:0005101"
+  provenance:
+    repo: PMC
+    publication: PMC9439210
+    contributors:
+      - kind: tool
+        name: tablassist
+        date: 06 MAY 2026