fix: add --all to cargo fmt in script/test and autoformat codebase

cargo fmt without --all fails with "Failed to find targets" in
workspace repos. This was blocking every story's gates. Also ran
cargo fmt --all to fix all existing formatting issues.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/chat/transport/matrix/bot/format.rs

@@ -104,7 +104,10 @@ mod tests {
     #[test]
     fn startup_announcement_uses_configured_display_name_not_hardcoded() {
         assert_eq!(format_startup_announcement("HAL"), "HAL is online.");
-        assert_eq!(format_startup_announcement("Assistant"), "Assistant is online.");
+        assert_eq!(
+            format_startup_announcement("Assistant"),
+            "Assistant is online."
+        );
     }
 
     #[test]