fix: quick-checks CI failures - taplo format, zepter, umbrella

1. TOML format (taplo): 123 files reformatted using correct config
   - Command: taplo format --config .config/taplo.toml

2. Zepter feature propagation fix:
   - pezframe-support: added pezsp-timestamp/try-runtime to try-runtime feature

3. generate-umbrella.py bug fix:
   - Script crashed when Cargo.toml/src didn't exist in umbrella dir
   - Added existence checks before deletion

bizinikiwi/pezframe/examples/tasks/Cargo.toml

@@ -56,10 +56,7 @@ try-runtime = [
 	"pezframe-system/try-runtime",
 	"pezsp-runtime/try-runtime",
 ]
-experimental = [
-	"pezframe-support/experimental",
-	"pezframe-system/experimental",
-]
+experimental = ["pezframe-support/experimental", "pezframe-system/experimental"]
 serde = []
 with-tracing = []
 tuples-96 = []