Bootstrap the first rail-kubernetes repo

declarations/rail.yaml

@@ -0,0 +1,26 @@
+kind: execution-rail
+rail_id: rail-kubernetes
+repo: rail-kubernetes
+ownership_repo: railiance-cluster
+execution_architecture: kubernetes
+status: wave-1-bootstrap
+supported_rollout_modes:
+  - stage1-run
+  - stage2-isolated-canary
+  - stage3-promote-rollback
+substrate_prerequisites:
+  - kubernetes-api
+  - helm-apply-path
+  - operator-driven-kubeconfig-access
+  - namespace-creation-supported
+compatibility_notes:
+  - Weighted routing is optional and must not be assumed in wave 1.
+  - Metrics availability is opportunistic and not a rollout success criterion.
+  - Storage guarantees remain explicit-review territory until S2 publishes them.
+source_documents:
+  - repo: railiance-master
+    path: docs/rail-kubernetes-boundary.md
+  - repo: railiance-cluster
+    path: docs/rail-kubernetes-extraction-map.md
+  - repo: railiance-cluster
+    path: docs/rail-kubernetes-substrate-profile.md