feat(sdk): metadata statiques contributes.mcpServers[].tools — #296 (type IdeAPluginMcpToolMetadata {name exact non vide, description optionnelle non vide} exporté public; validation manifest: tools optionnel, noms uniques par serveur — metadata d'affichage pour l'UI d'attribution de capacités, ne remplace ni ne cache MCP tools/list et n'enregistre rien; scripts/check-manifest-tools.mjs + npm run test:manifest intégré à check: optionnel/valide/doublon rejeté; doc manifest.md: exemple unity_get_scene/run_tests + règles; QA verte reconfirmée par Git: npm run check)

scripts/check-manifest-tools.mjs

@@ -0,0 +1,38 @@
+import assert from "node:assert/strict";
+
+import { validatePluginManifest } from "../dist/index.js";
+
+const base = {
+  ideaPluginManifestVersion: 1,
+  id: "dev.example.tools",
+  displayName: "Tools",
+  version: "1.0.0",
+  main: "dist/index.js",
+  trustLevel: "full",
+  capabilities: ["mcp"],
+  contributes: {
+    mcpServers: [
+      {
+        id: "server",
+        displayName: "Server",
+        command: "bin/server",
+        transport: "stdio"
+      }
+    ]
+  }
+};
+
+assert.equal(validatePluginManifest(base).success, true, "tools metadata remains optional");
+
+const withTools = structuredClone(base);
+withTools.contributes.mcpServers[0].tools = [
+  { name: "read_scene", description: "Read the active scene." },
+  { name: "run_tests" }
+];
+assert.equal(validatePluginManifest(withTools).success, true, "valid tools metadata is accepted");
+
+const duplicate = structuredClone(withTools);
+duplicate.contributes.mcpServers[0].tools.push({ name: "read_scene" });
+const duplicateResult = validatePluginManifest(duplicate);
+assert.equal(duplicateResult.success, false, "duplicate tool metadata is rejected");
+assert.ok(duplicateResult.errors.some((error) => error.includes("must be unique")));