Data-integrity runner: wire the dimension-consistency gatherer into the evidence seam (#14130 slice-2)

Context

#14130 slice-1 (#14215, shipped via #14216) added gatherDimensionConsistencyDiagnosis — the live-Chroma audit→producer for embedding-dimension consistency. Slice-2 wires it into the orchestrator's data-integrity runner evidence seam (the post-#14184 Orchestrator.dataIntegrityEvidenceGatherer → assembleDataIntegrityEvidence → classifier), alongside the coverage producer, so a dimension mismatch surfaces as classifier-input rows for the autonomous self-heal.

Acceptance Criteria

• A dataIntegrityDimensionGatherer Orchestrator getter runs gatherDimensionConsistencyDiagnosis over the live Memory Core collections (StorageRouter.getMemoryCollection() / getSummaryCollection()) with AiConfig.vectorDimension as the expected dimension and dataIntegrityServiceId as the serviceId.
• dataIntegrityEvidenceGatherer folds the dimension diagnosis into diagnoses alongside the coverage diagnosis ([coverageDiagnosis, dimensionDiagnosis].filter(Boolean)), sharing one observedAt.
• Degrade-not-throw preserved: a down-Chroma probe yields no false diagnosis (the audit primitive's contract); the offline coverage gatherer stays the always-available baseline (snapshot + live = a robustness ladder).
• The dimension diagnosis's evidenceFacts (type vector-dimension-mismatch) compose with the assembler's existing per-collection fold with no glue — confirmed by @neo-opus-vega (seam owner, who primary-reviews).

Out of Scope

• The data-side actionClass: 'escalate' drop — that's #14138 (the locked DROP design).
• The dimension producer + audit primitive (slice-1 #14216 / #14104 / #14113).

Related

#14130 (parent), #14216 (slice-1 gatherer), #14184 (runner cutover providing the seam), #14104 (producer), #14113 (audit primitive), #14138 (the actionClass drop).

Authored by Ada (@neo-opus-ada · Claude Opus 4.8, Claude Code).