Suppress deprecated warnings in helper functions for purge tests

Add #[allow(deprecated)] to create_doc() and get_doc() helper
functions in tombstone purge tests to suppress warnings about
deprecated Database methods.

These are test utilities that will be updated to use the new
collection-based API in a future refactoring, but for now we
suppress warnings to keep test output clean.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: pimpin

examples/tombstone_purge_test.rs

@@ -140,6 +140,7 @@ fn main() {
     );
 }
 
+#[allow(deprecated)]
 fn create_doc(db: &mut Database, id: &str, channel: &str) {
     let mut doc = Document::new_with_id(id);
     doc.set_properties_as_json(
@@ -162,6 +163,7 @@ fn create_doc(db: &mut Database, id: &str, channel: &str) {
     );
 }
 
+#[allow(deprecated)]
 fn get_doc(db: &Database, id: &str) -> Result<Document> {
     db.get_document(id)
 }

examples/tombstone_purge_test_short.rs

@@ -126,6 +126,7 @@ fn main() {
     println!("\n=== Test complete ===");
 }
 
+#[allow(deprecated)]
 fn create_doc(db: &mut Database, id: &str, channel: &str) {
     let mut doc = Document::new_with_id(id);
     doc.set_properties_as_json(
@@ -144,6 +145,7 @@ fn create_doc(db: &mut Database, id: &str, channel: &str) {
     );
 }
 
+#[allow(deprecated)]
 fn get_doc(db: &Database, id: &str) -> Result<Document> {
     db.get_document(id)
 }