fix(plugin-sdk): aligne le manifeste hello-plugin sur le schéma backend + fixture de test

Le manifeste hello-plugin était généré par un SDK obsolète/désaligné avec le
schéma backend actuel (champ ideaPluginManifestVersion manquant, displayName,
trustLevel, shape de contributes), ce qui faisait échouer l'installation avec
« invalid input: missing field ideaPluginManifestVersion ».

- SDK (manifest.ts/js, index.ts) aligné sur le schéma backend courant.
- hello-plugin (exemple + fixture) régénéré avec le manifeste valide.
- Base de tests fonctionnels plugins : fixture réelle versionnée
  (reference-minimal) + test d'installation/chargement bout en bout
  (plugin_install_load.rs), pour couvrir install/load/catalog depuis un
  dossier fixture réel.

Le sous-repo git imbriqué et vide (sdk/IdeaSDK/.git, 0 commit) a été
neutralisé pour que les sources du SDK soient suivies normalement dans ce
dépôt plutôt que comme gitlink vide.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sdk/IdeaSDK/examples/hello-plugin/README.md

@@ -0,0 +1,12 @@
+# Hello Plugin
+
+Minimal IdeA plugin example using the public SDK types.
+
+```sh
+npm run typecheck:examples
+npm run package:hello-plugin
+```
+
+The installable archive is emitted at `examples/hello-plugin/build/hello-plugin-0.1.0.zip`.
+It contains `idea-plugin.json` at the ZIP root and the compiled ESM entrypoint at
+`dist/index.js`, matching the manifest `main` field.

sdk/IdeaSDK/examples/hello-plugin/idea-plugin.json

@@ -0,0 +1,33 @@
+{
+  "ideaPluginManifestVersion": 1,
+  "id": "com.example.hello-plugin",
+  "displayName": "Hello Plugin",
+  "publisher": "IdeA Examples",
+  "version": "0.1.0",
+  "description": "Minimal IdeA plugin example.",
+  "main": "dist/index.js",
+  "engines": {
+    "idea": ">=0.1.0"
+  },
+  "trustLevel": "full",
+  "capabilities": [
+    "ui"
+  ],
+  "contributes": {
+    "menus": [
+      {
+        "id": "hello-plugin.menu",
+        "label": "Hello",
+        "topLevel": true
+      }
+    ],
+    "menuItems": [
+      {
+        "id": "hello-plugin.sayHello.item",
+        "targetMenuId": "hello-plugin.menu",
+        "label": "Say Hello",
+        "command": "hello-plugin.sayHello"
+      }
+    ]
+  }
+}

sdk/IdeaSDK/examples/hello-plugin/package-lock.json

@@ -0,0 +1,27 @@
+{
+  "name": "hello-plugin",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "hello-plugin",
+      "version": "0.1.0",
+      "dependencies": {
+        "@idea/plugin-sdk": "file:../.."
+      }
+    },
+    "../..": {
+      "name": "@idea/plugin-sdk",
+      "version": "0.1.0",
+      "license": "MIT",
+      "devDependencies": {
+        "typescript": "^5.5.0"
+      }
+    },
+    "node_modules/@idea/plugin-sdk": {
+      "resolved": "../..",
+      "link": true
+    }
+  }
+}

sdk/IdeaSDK/examples/hello-plugin/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "hello-plugin",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "main": "dist/index.js",
+  "scripts": {
+    "typecheck": "tsc -p tsconfig.json --noEmit"
+  },
+  "dependencies": {
+    "@idea/plugin-sdk": "file:../.."
+  }
+}
+

sdk/IdeaSDK/examples/hello-plugin/src/index.ts

@@ -0,0 +1,21 @@
+import type { ActivateContext, IdeAPluginModule } from "@idea/plugin-sdk";
+
+export function activate(ctx: ActivateContext): void {
+  ctx.logger.info("Hello from the IdeA hello plugin.");
+
+  const disposable = ctx.commands?.registerCommand("hello-plugin.sayHello", () => {
+    ctx.logger.info("Hello command executed.");
+    return "Hello from IdeA";
+  });
+
+  if (disposable) {
+    ctx.subscriptions.push(disposable);
+  }
+}
+
+const plugin: IdeAPluginModule = {
+  activate
+};
+
+export default plugin;
+

sdk/IdeaSDK/examples/hello-plugin/tsconfig.build.json

@@ -0,0 +1,19 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "declaration": false,
+    "declarationMap": false,
+    "noEmit": false,
+    "outDir": "dist",
+    "rootDir": "src",
+    "sourceMap": false,
+    "paths": {
+      "@idea/plugin-sdk": [
+        "../../dist/index.d.ts"
+      ]
+    }
+  },
+  "include": [
+    "src/**/*.ts"
+  ]
+}

sdk/IdeaSDK/examples/hello-plugin/tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "declaration": false,
+    "declarationMap": false,
+    "noEmit": true,
+    "rootDir": "../..",
+    "paths": {
+      "@idea/plugin-sdk": [
+        "../../src/index.ts"
+      ]
+    }
+  },
+  "include": [
+    "src/**/*.ts",
+    "../../src/**/*.ts"
+  ]
+}