Declare forge graph contracts

fabric/services/railiance-forge-source-forge.yaml

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+apiVersion: railiance.fabric/v1alpha1
+kind: ServiceDeclaration
+metadata:
+  id: railiance-forge.source-forge
+  name: Railiance source forge
+  owner: railiance-forge
+  repo: railiance-forge
+  domain: railiance
+  source_links:
+    - label: Forge scope
+      path: /home/worsch/railiance-forge/SCOPE.md
+    - label: Forge intent
+      path: /home/worsch/railiance-forge/INTENT.md
+spec:
+  lifecycle: active
+  environments: [dev, staging, prod]
+  description: Current Gitea source forge and future Forgejo migration surface for source hosting, registries, runner substrate, and release artifact evidence.
+  service_type: forge-runtime
+  provides_capabilities:
+    - railiance-forge.source-forge.source-hosting
+    - railiance-forge.source-forge.container-registry
+    - railiance-forge.source-forge.python-package-registry
+    - railiance-forge.source-forge.workflow-runner-substrate
+    - railiance-forge.source-forge.artifact-promotion-evidence
+  exposes_interfaces:
+    - railiance-forge.source-forge.web-ui
+    - railiance-forge.source-forge.git-ssh
+    - railiance-forge.source-forge.oci-registry
+    - railiance-forge.source-forge.python-package-index
+    - railiance-forge.source-forge.runner-label-contract
+    - railiance-forge.source-forge.evidence-contract