Bootstrap the first rail-kubernetes repo

docs/source-import-plan.md

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+# Source Import Plan
+
+## Purpose
+
+Record which reviewed source materials are expected to seed this repo.
+
+## First-Wave Imports
+
+Expected source documents from `railiance-cluster`:
+
+- `docs/deployment-lifecycle.md`
+- `docs/app-toml-contract.md`
+- `docs/overlay-repo-pattern.md`
+- `docs/canary-helm-template.md`
+- `docs/stage2-deploy-observe.md`
+- `docs/promote-rollback-onboarding.md`
+- `docs/railiance-run-command.md`
+
+Expected source assets from `railiance-cluster`:
+
+- `schemas/railiance-app.schema.json`
+- `examples/railiance/app.toml`
+- `tools/create_railiance_overlay_repo.sh`
+- `tools/cmd/railiance-run`
+- `tools/cmd/railiance-stage2`
+- `tools/cmd/railiance-stage3`
+
+## Deferred Migration Debt
+
+Do not import these into `rail-kubernetes` as part of wave 1:
+
+- workload-specific activity-core helper commands
+- workload-specific smoke or reconciliation helpers
+- cluster substrate operations
+- shared bootstrap helpers that still need a separate placement review
+
+## Rule
+
+Imports into this repo should preserve the boundary already reviewed in
+`railiance-master` and `railiance-cluster`.