test: make five suites Windows-runner clean

First ci-windows run exposed four platform assumptions in the fixtures:

- smoke: the scratch repo inherited the runner's system-wide
  core.autocrlf=true (Git for Windows default), so every index restore
  smudged LF to CRLF and broke the byte-exact assertions — pin
  core.autocrlf=false in the fixture (eol policy is not what these
  destructive-op tests are about).
- git / git-worktree: Windows TEMP is the 8.3 short form
  (C:\Users\RUNNER~1\...) while git reports long paths, and
  realpathSync does not expand 8.3 aliases — switch the canonicalizer
  to realpathSync.native (libuv resolves via GetFinalPathNameByHandle,
  which does); same trick as the existing macOS /var workaround.
- bundle-route: the ETag memo revalidates on stat (mtime+size) and
  Windows updates file timestamps lazily, so the equal-size rewrite
  still looked unchanged — change the length too.
- market-manifest: GNU tar (Git Bash) reads the drive-letter colon of
  absolute Windows paths as a remote-host spec — run it from the pack
  dir with the bare tarball name instead.

tests/git.spec.ts

@@ -11,8 +11,12 @@ import { parseLogLines, parsePorcelainZ, repoRoots, status } from '../src/git.ts
 const execFileAsync = promisify(execFile)
 const normalizePath = (path: string): string => path.replaceAll('\\', '/')
 // macOS tmpdir() is the /var symlink while git reports the resolved
-// /private/var prefix — canonicalize both sides before comparing.
-const canonical = (path: string): string => normalizePath(realpathSync(path))
+// /private/var prefix; on Windows TEMP is often the 8.3 short form
+// (C:\Users\RUNNER~1\...) while git reports the long path. The NATIVE
+// realpath resolves both aliasings (libuv canonicalizes on Windows via
+// GetFinalPathNameByHandle, which expands 8.3 names) — canonicalize both
+// sides before comparing.
+const canonical = (path: string): string => normalizePath(realpathSync.native(path))
 
 describe('git parsing', () => {
   it('discovers and selects direct child repositories under a workspace directory', async () => {