feat: introduced githooks to strip --trailers in commit messages

Author: AsieduDevelopmentHub

.githooks/README.md

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+## Repo git hooks
+
+This repository keeps git hooks in `.githooks/`.
+
+### Enable
+
+Run this once in the repo:
+
+```bash
+git config core.hooksPath .githooks
+```
+
+### What it does
+
+- `commit-msg`: removes any `Co-authored-by: Cursor ...` trailer lines from commit messages.
+- `prepare-commit-msg`: same removal earlier in the flow (best-effort).
+

.githooks/commit-msg

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+#!/bin/sh
+set -eu
+
+# Strip Cursor co-author trailer(s) from commit message.
+# Runs after the message is composed, before the commit is finalized.
+#
+# Usage: enable repo hooks with:
+#   git config core.hooksPath .githooks
+
+MSG_FILE="${1:-}"
+if [ -z "$MSG_FILE" ] || [ ! -f "$MSG_FILE" ]; then
+  exit 0
+fi
+
+tmp="${MSG_FILE}.tmp.$$"
+
+# Remove any "Co-authored-by: Cursor ..." trailer lines (case-insensitive).
+# Keep all other co-authors intact.
+awk '
+BEGIN { IGNORECASE = 1 }
+/^[[:space:]]*Co-authored-by:[[:space:]]*Cursor([[:space:]]|<|$)/ { next }
+/^[[:space:]]*Co-Authored-By:[[:space:]]*Cursor([[:space:]]|<|$)/ { next }
+{ print }
+' "$MSG_FILE" > "$tmp"
+
+mv "$tmp" "$MSG_FILE"
+
+exit 0

.githooks/prepare-commit-msg

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+#!/bin/sh
+set -eu
+
+# Also strip Cursor trailer during message preparation (helps with templates/squash).
+# This is a best-effort duplicate of commit-msg; commit-msg is the final gate.
+
+MSG_FILE="${1:-}"
+if [ -z "$MSG_FILE" ] || [ ! -f "$MSG_FILE" ]; then
+  exit 0
+fi
+
+tmp="${MSG_FILE}.tmp.$$"
+
+awk '
+BEGIN { IGNORECASE = 1 }
+/^[[:space:]]*Co-authored-by:[[:space:]]*Cursor([[:space:]]|<|$)/ { next }
+/^[[:space:]]*Co-Authored-By:[[:space:]]*Cursor([[:space:]]|<|$)/ { next }
+{ print }
+' "$MSG_FILE" > "$tmp"
+
+mv "$tmp" "$MSG_FILE"
+
+exit 0