Declare forge graph contracts

fabric/interfaces/railiance-forge-git-ssh.yaml

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+apiVersion: railiance.fabric/v1alpha1
+kind: InterfaceDeclaration
+metadata:
+  id: railiance-forge.source-forge.git-ssh
+  name: Git SSH endpoint
+  owner: railiance-forge
+  repo: railiance-forge
+  domain: railiance
+  source_links:
+    - label: Observability and evidence contract
+      path: /home/worsch/railiance-forge/docs/observability-operating-evidence.md
+spec:
+  lifecycle: planned
+  environments: [dev, staging, prod]
+  description: Git-over-SSH endpoint contract for repository clone, fetch, and push operations when exposed.
+  interface_type: git-ssh
+  version: gitea-current
+  service_id: railiance-forge.source-forge
+  capability_ids:
+    - railiance-forge.source-forge.source-hosting
+  endpoint:
+    notes: Record the published SSH host and port once the endpoint is verified.
+  auth:
+    method: static_secret
+  data_classification: confidential