Add provider contract validation CI and tinynode-to-rerum fixture

Agent-Logs-Url: https://github.com/CenterForDigitalHumanities/rerum_server_nodejs/sessions/35103546-cf43-4e3a-8f6b-9289eda2e8f3

Co-authored-by: cubap <1119165+cubap@users.noreply.github.com>

Author: Copilot

.github/workflows/contract-validation.yml

@@ -0,0 +1,19 @@
+name: Provider Contract Validation
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  validate-tinynode-to-rerum:
+    uses: cubap/rerum_openapi/.github/workflows/seam-runtime-validation.yml@main
+    with:
+      contract_repo_ref: main
+      seam_manifest_path: seams/tinynode-to-rerum/manifest.yaml
+      target_base_url: https://store.rerum.io/v1
+      compare_paths: true
+      compare_operations: true
+      fixture_file: test/contract-fixtures/tinynode-to-rerum.yaml
+      timeout_ms: 10000

test/contract-fixtures/tinynode-to-rerum.yaml

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+interactions:
+  - description: Read an existing object by id
+    path: /id/{id}
+    method: get
+    expectedStatus: "200"
+    response:
+      body:
+        "@id": https://store.rerum.io/v1/id/test123
+        "@type": "http://www.w3.org/ns/oa#Annotation"
+        __rerum:
+          APIversion: "1.1.0"
+          generatedBy: https://store.rerum.io/agent
+          history:
+            prime: https://store.rerum.io/v1/id/test123
+            next: []
+            previous: ""
+          isReleased: ""
+          releaseDate: ""
+          releases:
+            next: []
+            previous: ""
+            replaces: ""
+
+  - description: Query objects with a filter
+    path: /api/query
+    method: post
+    request:
+      "@type": "http://www.w3.org/ns/oa#Annotation"
+    expectedStatus: "200"
+    response:
+      body:
+        - "@id": https://store.rerum.io/v1/id/test123
+          "@type": "http://www.w3.org/ns/oa#Annotation"
+          __rerum:
+            APIversion: "1.1.0"
+            generatedBy: https://store.rerum.io/agent
+            history:
+              prime: https://store.rerum.io/v1/id/test123
+              next: []
+              previous: ""
+            isReleased: ""
+            releaseDate: ""
+            releases:
+              next: []
+              previous: ""
+              replaces: ""