Don't dispose llama in tests - let process exit handle cleanup

The Metal backend crash happens regardless of whether we dispose or not.
It's a known llama.cpp issue during process exit static destructor cleanup:
https://github.com/ggml-org/llama.cpp/pull/17869

All 297 tests pass - the abort happens after tests complete.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/eval.test.ts

@@ -392,8 +392,7 @@ describe("Hybrid Search (RRF)", () => {
 // Cleanup
 // =============================================================================
 
-afterAll(async () => {
-  // Dispose llama before process exit to properly free Metal resources
-  await disposeDefaultLlamaCpp();
+afterAll(() => {
+  // Don't dispose llama - let process exit handle Metal cleanup naturally
   rmSync(tempDir, { recursive: true, force: true });
 });

src/llm.test.ts

@@ -12,6 +12,7 @@ import {
   LlamaCpp,
   getDefaultLlamaCpp,
   setDefaultLlamaCpp,
+  disposeDefaultLlamaCpp,
   type RerankDocument,
 } from "./llm.js";
 
@@ -20,9 +21,7 @@ import {
 // =============================================================================
 
 describe("Default LlamaCpp Singleton", () => {
-  afterAll(() => {
-    setDefaultLlamaCpp(null);
-  });
+  // Don't dispose - let process exit handle Metal cleanup naturally
 
   test("getDefaultLlamaCpp creates instance on first call", () => {
     setDefaultLlamaCpp(null);
@@ -87,9 +86,7 @@ describe("LlamaCpp Integration", () => {
     llm = new LlamaCpp();
   });
 
-  afterAll(async () => {
-    await llm.dispose();
-  });
+  // Don't dispose - let process exit handle Metal cleanup naturally
 
   describe("embed", () => {
     test("returns embedding with correct dimensions", async () => {

src/mcp.test.ts

@@ -10,7 +10,7 @@ import { Database } from "bun:sqlite";
 import * as sqliteVec from "sqlite-vec";
 import { McpServer, ResourceTemplate } from "@modelcontextprotocol/sdk/server/mcp.js";
 import { z } from "zod";
-import { setDefaultLlamaCpp, LlamaCpp } from "./llm";
+import { setDefaultLlamaCpp, disposeDefaultLlamaCpp, LlamaCpp } from "./llm";
 import { mkdtemp, writeFile, readdir, unlink, rmdir } from "node:fs/promises";
 import { join } from "node:path";
 import { tmpdir } from "node:os";
@@ -225,7 +225,7 @@ describe("MCP Server", () => {
   });
 
   afterAll(async () => {
-    setDefaultLlamaCpp(null);
+    // Don't dispose llama - let process exit handle Metal cleanup naturally
     testDb.close();
     try {
       require("fs").unlinkSync(testDbPath);