Add a regression test for the .scm preload loader

Per review on #1286: nothing asserted the loader behavior itself. This
imports the go tree-sitter query .scm directly and asserts it arrives as
a non-empty string with capture syntax intact. Without the preload the
file fails to load at all (verified: running it without the cli/bunfig
preload fails), so a future refactor cannot silently regress the loader.

🤖 Generated with Codebuff
Co-Authored-By: Codebuff <noreply@codebuff.com>

Author: lab1207

cli/src/__tests__/scm-loader.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, test } from 'bun:test'
+
+import goQuery from '../../../packages/code-map/src/tree-sitter-queries/tree-sitter-go-tags.scm'
+
+/**
+ * Guards test/setup-scm-loader.ts (registered as a preload in
+ * cli/bunfig.toml). Without it, importing any module that reaches
+ * @codebuff/sdk — which re-exports code-map, which imports .scm
+ * tree-sitter query files — dies at import time with "Unknown file type",
+ * which bun reports as an unhandled error between tests rather than a
+ * failure (see docs/testing.md). This file imports a .scm directly: if the
+ * preload is missing or regresses, the whole file fails to load instead of
+ * passing vacuously.
+ */
+describe('setup-scm-loader preload', () => {
+  test('loads .scm imports as strings', () => {
+    expect(typeof goQuery).toBe('string')
+    expect(goQuery.length).toBeGreaterThan(0)
+    // Tree-sitter queries capture nodes with @capture names; the go tags
+    // query is nontrivial, so this also proves the content came through
+    // intact rather than as an empty stub.
+    expect(goQuery).toContain('@')
+  })
+})