fix(test): disable cache in git-extended real operations tests

Add cache: false to getChangedFiles() calls in "real git operations"
tests to prevent stale cached results from causing test failures on
Windows. The git functions cache results by default, and on Windows
the tests were getting empty cached arrays instead of fresh git status.

Fixes 4 test failures on Windows Server 2025:
- should work with a temporary git repository
- should detect untracked files
- should handle nested directories
- should work with sync functions

Author: jdalton

test/unit/git-extended.test.ts

@@ -216,7 +216,7 @@ describe('git extended tests', () => {
         await fs.writeFile(testFile, 'test content', 'utf8')
 
         // File should appear as changed (untracked)
-        const changed = await getChangedFiles({ cwd: tmpDir })
+        const changed = await getChangedFiles({ cache: false, cwd: tmpDir })
         expect(changed).toContain('test.txt')
 
         // Stage the file
@@ -277,7 +277,7 @@ describe('git extended tests', () => {
         const untracked = path.join(tmpDir, 'untracked.txt')
         await fs.writeFile(untracked, 'untracked', 'utf8')
 
-        const changed = await getChangedFiles({ cwd: tmpDir })
+        const changed = await getChangedFiles({ cache: false, cwd: tmpDir })
         expect(changed).toContain('untracked.txt')
 
         // Untracked files should not appear in unstaged (they're not tracked)
@@ -300,7 +300,7 @@ describe('git extended tests', () => {
         const nestedFile = path.join(subdir, 'nested.txt')
         await fs.writeFile(nestedFile, 'nested content', 'utf8')
 
-        const changed = await getChangedFiles({ cwd: tmpDir })
+        const changed = await getChangedFiles({ cache: false, cwd: tmpDir })
         // Git may show directory or full path depending on config
         expect(changed.length).toBeGreaterThan(0)
         const hasFile = changed.some(
@@ -327,7 +327,7 @@ describe('git extended tests', () => {
         const testFile = path.join(tmpDir, 'sync-test.txt')
         await fs.writeFile(testFile, 'sync content', 'utf8')
 
-        const changedSync = getChangedFilesSync({ cwd: tmpDir })
+        const changedSync = getChangedFilesSync({ cache: false, cwd: tmpDir })
         expect(changedSync).toContain('sync-test.txt')
 
         spawnSync('git', ['add', 'sync-test.txt'], { cwd: tmpDir })