Remove tests/ from repo; add to .gitignore

Integration tests require a live CUCM cluster and contain sensitive
test config — not appropriate for the public repo. Local files are
preserved; tests/ is now ignored by git.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: mycollablab

.gitignore

@@ -24,8 +24,8 @@ go.work.sum
 /dist/
 /bin/
 
-# Test configuration (contains sensitive CUCM credentials — copy from test-config.json.example)
-tests/testdata/test-config.json
+# Integration tests (require real CUCM — not committed to repo)
+tests/
 
 # macOS
 .DS_Store