test: add tests for graphile-llm — embedder unit tests, schema enrichment, Ollama integration

Three test suites:
1. Embedder abstraction: unit tests for buildEmbedder, buildEmbedderFromModule, buildEmbedderFromEnv
2. Schema enrichment: verifies text field on VectorNearbyInput and embeddingText on mutation inputs (requires PostgreSQL + pgvector)
3. Real Ollama embedding: tests nomic-embed-text produces correct 768-dim vectors and semantic similarity (requires Ollama)

Tests gracefully skip when PostgreSQL or Ollama are not available.

Author: pyramation

graphile/graphile-llm/jest.config.js

@@ -0,0 +1,19 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  testTimeout: 60000,
+  transform: {
+    '^.+\\.tsx?$': [
+      'ts-jest',
+      {
+        babelConfig: false,
+        tsconfig: 'tsconfig.json'
+      }
+    ]
+  },
+  transformIgnorePatterns: [`/node_modules/*`],
+  testRegex: '(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$',
+  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
+  modulePathIgnorePatterns: ['dist/*']
+};

graphile/graphile-llm/package.json

@@ -49,7 +49,11 @@
   },
   "devDependencies": {
     "@types/node": "^22.19.11",
-    "makage": "^0.3.0"
+    "graphile-connection-filter": "workspace:^",
+    "graphile-search": "workspace:^",
+    "graphile-test": "workspace:^",
+    "makage": "^0.3.0",
+    "pgsql-test": "workspace:^"
   },
   "keywords": [
     "postgraphile",