Bootstrap grouped home reef repo

docs/source-backed-substrate-facts.md

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+# Source-Backed Substrate Facts
+
+## Purpose
+
+Record the first source-backed facts imported into `reef-railiance` for the
+grouped home reef bootstrap.
+
+## Imported Facts
+
+From `railiance-infra/inventory/servers.yaml`:
+
+- current first member: `Railiance01`
+- member IP: `92.205.62.239`
+- member SSH user: `tegwick`
+
+From `railiance-infra/docs/reef-first-wave-source-map.md`:
+
+- this repo represents the grouped Railiance home reef rather than a singleton
+  host repo
+- `rail-kubernetes` is the first primary rail stance
+- additional Railiance home servers should join this reef when they share the
+  same lifecycle and workload-placement boundary
+
+From `railiance-infra/docs/adr/ADR-004-forgejo-in-cluster-actions-runner.md`:
+
+- Forgejo production and the in-cluster Actions runner already use
+  `railiance01` as a Kubernetes-first operational substrate
+
+## Explicit Gaps
+
+- only one source-backed member is declared today
+- there is still no dedicated `host_vars/Railiance01.yml`
+- future grouped members and split criteria remain explicit follow-up work