chore(gitignore): ignore test/temp/ archive fixtures

test/unit/archives.test.mts writes fixtures into test/temp/ and cleans
them in afterAll(), but if the test process is interrupted (e.g. vitest
watch killed mid-run) the fixtures get left behind as untracked files
that clutter git status. Gitignore the directory so leftovers don't
leak into future commits.

Author: jdalton

.gitignore

@@ -57,6 +57,7 @@ dist/
 *.backup
 *.bak
 *.orig
+/test/temp/
 
 # ============================================================================
 # Archive directories