test(windows): name the B2, B4, B5 and B12 tests in the curated Windows lane

The runtime-root bundle tests lived in browse/test/config.test.ts and the
Copilot glossary test in test/host-config.test.ts, both excluded from the
Windows lane, so the two Windows-only fixes were never checked on Windows.
Move each into its own Windows-safe file (unchanged assertions) and list it,
the piped-stdin chain test and the /cso docker.exe discovery test as named
Windows coverage in scripts/lib/windows-curation.ts.

test/copilot-windows-bash.test.ts

@@ -0,0 +1,17 @@
+/**
+ * Copilot CLI on Windows ran gstack's extensionless helpers straight from
+ * PowerShell. The Copilot tool glossary (rendered into every Copilot skill)
+ * names Git for Windows Bash by full path. Kept out of host-config.test.ts,
+ * which the curated Windows lane excludes, so Windows runs this check.
+ */
+import { describe, expect, test } from 'bun:test';
+
+describe('#3047: Copilot on Windows runs bash blocks in Git for Windows Bash', () => {
+  test('the Copilot tool glossary names Git Bash by full path and forbids PowerShell translation', async () => {
+    const { default: copilot } = await import('../hosts/copilot');
+    const glossary = JSON.stringify(copilot.toolRewrites);
+    expect(glossary).toContain('Git for Windows Bash by its full path');
+    expect(glossary).toContain('bare `bash` can start WSL');
+    expect(glossary).toContain('Never translate a block into PowerShell');
+  });
+});

test/host-config.test.ts

@@ -790,13 +790,3 @@ describe('host renders name the host\'s own tools and identities (#2626, #2015,
     }
   });
 });
-
-describe('#3047: Copilot on Windows runs bash blocks in Git for Windows Bash', () => {
-  test('the Copilot tool glossary names Git Bash by full path and forbids PowerShell translation', async () => {
-    const { default: copilot } = await import('../hosts/copilot');
-    const glossary = JSON.stringify(copilot.toolRewrites);
-    expect(glossary).toContain('Git for Windows Bash by its full path');
-    expect(glossary).toContain('bare `bash` can start WSL');
-    expect(glossary).toContain('Never translate a block into PowerShell');
-  });
-});