Add activity-core scope context API

docs/schemas/repo-scope-context-response.json

@@ -0,0 +1,59 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://repo-scoping.local/schemas/repo-scope-context-response.json",
+  "title": "Repository Scope Context Response",
+  "description": "Provider-side context contract returned by GET /repos/{repo_slug}/scope/context for activity-core.",
+  "type": "object",
+  "additionalProperties": false,
+  "required": [
+    "repo_slug",
+    "capabilities",
+    "tags",
+    "scope_md_exists",
+    "scope_summary"
+  ],
+  "properties": {
+    "repo_slug": {
+      "type": "string",
+      "description": "Slug requested by the caller after normal slugification.",
+      "examples": ["repo-scoping"]
+    },
+    "capabilities": {
+      "type": "array",
+      "description": "Approved capability names from the repository ability map.",
+      "items": {
+        "type": "string"
+      },
+      "examples": [["Generate SCOPE.md", "Preview generated SCOPE.md"]]
+    },
+    "tags": {
+      "type": "array",
+      "description": "Stable, sorted union of approved ability and capability primary_class values plus their attributes.",
+      "items": {
+        "type": "string"
+      },
+      "examples": [["api", "generation", "scope"]]
+    },
+    "scope_md_exists": {
+      "type": "boolean",
+      "description": "True when repo-scoping can inspect a local or cached checkout and root SCOPE.md exists; false when absent or unknown.",
+      "examples": [true]
+    },
+    "scope_summary": {
+      "description": "First non-empty paragraph of root SCOPE.md when inspectable; otherwise approved scope description, repository description, or null.",
+      "type": ["string", "null"],
+      "examples": [
+        "Repository Scoping maps repositories into reviewable scope graphs."
+      ]
+    }
+  },
+  "examples": [
+    {
+      "repo_slug": "repo-scoping",
+      "capabilities": ["Generate SCOPE.md"],
+      "tags": ["api", "generation", "scope"],
+      "scope_md_exists": true,
+      "scope_summary": "Repository Scoping maps repositories into reviewable scope graphs."
+    }
+  ]
+}