fixup! add ci prettier changed-file check

Author: benzekrimaha

scripts/format-changed.sh

@@ -1,6 +1,17 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# Purpose:
+# - Run Prettier in CI only on files changed in the current branch/PR.
+# - Avoid blocking PRs because of legacy formatting in untouched files.
+#
+# It works by:
+# 1) Resolving a diff base from BASE_SHA, BASE_REF, or DEFAULT_BASE.
+# 2) Ensuring that base commit exists locally (fetch shallow history when needed).
+# 3) Listing changed files between base..HEAD, keeping only supported extensions.
+# 4) Running `prettier --check` on that filtered list.
+# 5) Exiting 0 when no supported files changed.
+
 ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 cd "$ROOT_DIR"
 
@@ -9,10 +20,13 @@ BASE_REF="${BASE_REF:-${GITHUB_BASE_REF:-}}"
 DEFAULT_BASE="${DEFAULT_BASE:-origin/main}"
 
 if [[ -n "$BASE_SHA" ]]; then
+    # Preferred in PR CI: exact base commit SHA
     DIFF_BASE="$BASE_SHA"
 elif [[ -n "$BASE_REF" ]]; then
+    # Fallback: base branch name (e.g. main)
     DIFF_BASE="origin/${BASE_REF#origin/}"
 else
+    # Local default when no CI vars are provided
     DIFF_BASE="$DEFAULT_BASE"
 fi