fix: resolve all clippy --all-targets warnings across 15 files

- gateway/mod.rs: move send_json before test module (items_after_test_module)
- memory/vector.rs: fix float_cmp, cast_precision_loss, approx_constant
- memory/chunker.rs: fix format_collect, format_push_string, write_with_newline
- memory/sqlite.rs: fix useless_vec
- heartbeat/engine.rs: fix format_collect, write_with_newline
- config/schema.rs: fix needless_raw_string_hashes
- tools/composio.rs: fix needless_raw_string_hashes
- integrations/registry.rs: fix uninlined_format_args, unused import
- tunnel/mod.rs: fix doc_markdown
- skills/mod.rs: allow similar_names in test module
- channels/cli.rs: fix unreadable_literal
- observability/mod.rs: fix manual_string_new
- runtime/mod.rs: fix manual_string_new
- examples/custom_memory.rs: add Default impl (new_without_default)
- examples/custom_channel.rs: fix needless_borrows_for_generic_args

src/channels/cli.rs

@@ -92,13 +92,13 @@ mod tests {
             sender: "user".into(),
             content: "hello".into(),
             channel: "cli".into(),
-            timestamp: 1234567890,
+            timestamp: 1_234_567_890,
         };
         assert_eq!(msg.id, "test-id");
         assert_eq!(msg.sender, "user");
         assert_eq!(msg.content, "hello");
         assert_eq!(msg.channel, "cli");
-        assert_eq!(msg.timestamp, 1234567890);
+        assert_eq!(msg.timestamp, 1_234_567_890);
     }
 
     #[test]