feat: establish read-only DocForge MCP foundation

schemas/project.schema.json

@@ -0,0 +1,46 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://docforge.local/schema/project-v1.json",
+  "title": "DocForge project descriptor",
+  "type": "object",
+  "required": ["schema_version", "project_id", "title", "adapter", "sources", "derived", "graph"],
+  "properties": {
+    "schema_version": { "const": 1 },
+    "project_id": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]{1,127}$" },
+    "title": { "type": "string", "minLength": 1 },
+    "adapter": { "type": "string", "minLength": 1 },
+    "sources": {
+      "type": "object",
+      "required": ["content_roots", "authority_files"],
+      "properties": {
+        "content_roots": { "$ref": "#/$defs/pathList" },
+        "authority_files": { "$ref": "#/$defs/pathList" }
+      },
+      "additionalProperties": false
+    },
+    "derived": {
+      "type": "object",
+      "required": ["cache_root", "index"],
+      "properties": {
+        "cache_root": { "$ref": "#/$defs/relativePath" },
+        "index": { "$ref": "#/$defs/relativePath" }
+      },
+      "additionalProperties": false
+    },
+    "graph": {
+      "type": "object",
+      "required": ["allowed_relations"],
+      "properties": {
+        "allowed_relations": { "type": "array", "minItems": 1, "uniqueItems": true, "items": { "type": "string", "pattern": "^[a-z0-9][a-z0-9._-]{1,127}$" } }
+      },
+      "additionalProperties": false
+    },
+    "limits": { "type": "object" },
+    "profiles": { "type": "array" }
+  },
+  "$defs": {
+    "relativePath": { "type": "string", "minLength": 1, "not": { "pattern": "(^/|(^|/)\\.\\.(/|$))" } },
+    "pathList": { "type": "array", "uniqueItems": true, "items": { "$ref": "#/$defs/relativePath" } }
+  },
+  "additionalProperties": false
+}