feat(justfile): add check-fmt and check recipes; pre-commit hook

Split concerns: fmt-check (check-fmt) from lint. check-fmt mirrors fmt
with each tool's --check/-d flag. check runs both as a single quality
gate. A new .githooks/pre-commit runs 'just check' on every commit;
bypass with git commit --no-verify.

Also drop just --fmt --check and prettier --check from the lint recipe
(they're format checks, belong in check-fmt).

1 files changed, 3 insertions, 0 deletions

diff --git a/.githooks/pre-commit b/.githooks/pre-commit
new file mode 100755
index 0000000..8ee1775
--- /dev/null
+++ b/.githooks/pre-commit
@@ -0,0 +1,3 @@
+#!/bin/sh
+# Code quality gate. Bypass with: git commit --no-verify
+exec just check