chore: add auto-push git workflow

AGENTS.md

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+# Agent Instructions
+
+- Zu jeder Codeaenderung eine Commit-Nachricht vorschlagen.
+- Commit-Nachricht so kurz wie moeglich halten, maximal 120 Zeichen.
+- Gilt fuer jede Sitzung in diesem Repository.
+- Standard-Workflow fuer den Agenten: Nach jeder Codeaenderung automatisch `git add`, `git commit` und `git push` ausfuehren.
+- Falls `git push` fehlschlaegt (z. B. Konflikt oder Reject), den Fehler sofort melden und kurz den naechsten sicheren Schritt vorschlagen.
+- Ausnahme: Nur dann nicht automatisch committen und pushen, wenn der User es fuer den konkreten Task explizit anders vorgibt.
+- Konsistente, saubere Loesungen umsetzen; keine Quick-Fixes als Endloesung.

scripts/install-git-hooks.sh

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+#!/bin/sh
+
+set -eu
+
+repo_root=$(git rev-parse --show-toplevel)
+hooks_dir="$repo_root/.git/hooks"
+
+mkdir -p "$hooks_dir"
+
+cat >"$hooks_dir/prepare-commit-msg" <<'EOF'
+#!/bin/sh
+
+# Fill commit message from .git/CODEX_COMMIT_MSG when user commits via UI without text.
+
+msg_file="$1"
+commit_source="${2:-}"
+
+case "$commit_source" in
+  message|merge|squash)
+    exit 0
+    ;;
+esac
+
+# If there is already a real message line, keep it untouched.
+if grep -Eq '^[[:space:]]*[^#[:space:]]' "$msg_file"; then
+  exit 0
+fi
+
+codex_msg_file="$(git rev-parse --git-path CODEX_COMMIT_MSG)"
+
+if [ -s "$codex_msg_file" ]; then
+  # Take first line only to keep messages short and predictable.
+  head -n 1 "$codex_msg_file" | tr -d '\r' > "$msg_file"
+fi
+EOF
+
+cat >"$hooks_dir/post-commit" <<'EOF'
+#!/bin/sh
+
+# Auto-push after each successful commit.
+# If no upstream exists yet, set it to origin/<current-branch>.
+
+branch=$(git symbolic-ref --quiet --short HEAD 2>/dev/null) || exit 0
+codex_msg_file="$(git rev-parse --git-path CODEX_COMMIT_MSG)"
+
+if ! git remote get-url origin >/dev/null 2>&1; then
+  echo "post-commit: remote 'origin' not found, skipping auto-push." >&2
+  rm -f "$codex_msg_file" >/dev/null 2>&1 || true
+  exit 0
+fi
+
+if git rev-parse --abbrev-ref --symbolic-full-name '@{u}' >/dev/null 2>&1; then
+  git push
+else
+  git push --set-upstream origin "$branch"
+fi
+
+# Consume prepared Codex message after the commit.
+rm -f "$codex_msg_file" >/dev/null 2>&1 || true
+EOF
+
+chmod +x "$hooks_dir/prepare-commit-msg" "$hooks_dir/post-commit"
+echo "Installed git hooks in $hooks_dir"