Adjust commit hooks to reapply unstaged changes and fail early in pre-commit checks

Author: sky1e

post-commit.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+git stash pop

tests.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-
+set -e
 cargo fmt --all --check
 cargo test --quiet --locked
 cargo clippy -- --deny warnings