overlay-skills-require-all-7-layer-orchestrator-cross-refs

The 3 domain overlay skills (fintech, healthcare, b2b-enterprise) were missing cross-references to all 7 layer orchestrators, breaking the integration grid. Each overlay must reference every orchestrator layer it can activate — not just the ones most relevant — so Claude can route from domain context to the right capability. Fixed by adding a cross-ref block to each overlay listing all 7 layer orchestrators.