diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index 861fcf9..186b2df 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -1,161 +1,34 @@
-# Copilot Run Instructions – Minecraft Server on Proxmox (Simulation Mode)
-
-## Zweck
-Nur erklären und Änderungen als **Diff** erzeugen. **Keine** Skripte ausführen. **Kein Build**. Ziel ist ein durchgängiger CLI-Ablauf mit GitHub Copilot CLI.
-
-## Voraussetzungen
-1) Git, GitHub CLI und Copilot CLI sind eingerichtet.  
-2) Du arbeitest im Repo-Klon.
-
-```bash
-cd "$HOME/github_repos/minecraft-server-Proxmox"
-git status
-````
-
----
-
-## Antworten auf „Run/Build?“
-
-Immer Simulation. Nur Beispiele zeigen, nichts lokal ausführen.
-
-**Option 1: Java in VM**
-
-```bash
-chmod +x setup_minecraft.sh
-./setup_minecraft.sh
-sudo -u minecraft screen -r minecraft
-```
-
-**Option 2: Java in LXC**
-
-```bash
-chmod +x setup_minecraft_lxc.sh
-./setup_minecraft_lxc.sh
-sudo -u minecraft screen -r minecraft
-```
-
-**Option 3: Bedrock**
-
-```bash
-chmod +x setup_bedrock.sh
-./setup_bedrock.sh
-sudo -u minecraft screen -r bedrock
-```
-
-**Option 4: Java aktualisieren (PaperMC)**
-
-```bash
-chmod +x update.sh
-./update.sh
-```
-
-**Option 5: systemd Autostart (optional, Java)**
-
-```bash
-sudo cp minecraft.service /etc/systemd/system/minecraft.service
-sudo systemctl daemon-reload
-sudo systemctl enable --now minecraft
-```
-
-> Diese Befehle sind **Beispiele** für externe Systeme. In dieser Umgebung nur erklären. Details siehe `SIMULATION.md`.
-
----
-
-## Safe-Workflow mit Copilot CLI
-
-### 1) Arbeitszweig vorbereiten
-
-```bash
-cd "$HOME/github_repos/minecraft-server-Proxmox"
-git switch -c copilot/refactor-sim || git switch copilot/refactor-sim
-```
-
-### 2) Audit + Refactor per Ein-Prompt (nur Diff ausgeben lassen)
-
-```bash
-gh copilot chat -p '
-Refactor this repo in SIMULATION ONLY. Do not execute anything. Output a single unified diff file named refactor.diff (git apply -p0 friendly). Scope:
-
-1) setup_minecraft.sh + setup_minecraft_lxc.sh
-   - If OpenJDK 21 missing on Debian 12, add fallback: install Amazon Corretto 21 via APT with /usr/share/keyrings keyring and signed-by pin.
-   - Auto-size JVM memory from /proc/meminfo: -Xms = 1/4, -Xmx = 1/2 of RAM (min 1G/2G).
-   - Ensure /run/screen exists (chmod 775, root:utmp) before screen -dmS.
-
-2) setup_bedrock.sh
-   - Regex for artifact: bedrock-server-[0-9.]+\.zip
-   - HEAD check: Content-Type must be application/zip before download.
-   - Enforce checksum by default: REQUIRE_BEDROCK_SHA=1 and REQUIRED_BEDROCK_SHA256 mandatory.
-   - Create /run/screen as above.
-
-3) minecraft.service
-   - Run as User/Group=minecraft.
-   - Hardening: NoNewPrivileges=true, ProtectSystem=full, ProtectHome=true, PrivateTmp=true,
-     ProtectKernelTunables=true, ProtectKernelModules=true, ProtectControlGroups=true,
-     RestrictSUIDSGID=true, RestrictNamespaces=true, CapabilityBoundingSet=,
-     AmbientCapabilities=, ReadWritePaths=/opt/minecraft.
-
-4) Backups
-   - Add RETAIN_DAYS env default=7 and ExecStartPost cleanup with find … -mtime +$RETAIN_DAYS -delete.
-
-5) Docs
-   - Create COPILOT_RUN_INSTRUCTIONS.md (this file) summary link in README.
-   - README: mention Java 21 requirement with Corretto fallback, UFW install before ufw commands, memory auto-sizing note,
-     Bedrock checksum enforcement note, and link to SIMULATION.md.
-
-Constraints:
-- Do NOT run or simulate shell in this environment. Produce only a single file: refactor.diff.
-- Touch only the files above + README.md + new COPILOT_RUN_INSTRUCTIONS.md as needed.
-- Keep changes minimal and consistent with current style.
-'
-```
-
-### 3) Diff holen und prüfen
-
-Copilot legt die Datei an oder zeigt sie an. Wenn als Datei erstellt:
-
-```bash
-ls -lh refactor.diff
-```
-
-Wenn nur als Chat-Ausgabe kam, speichere sie:
-
-```bash
-nano refactor.diff
-# Inhalt aus der Copilot-Antwort einfügen, speichern
-```
-
-### 4) Diff anwenden und committen
-
-```bash
-git apply -p0 refactor.diff
-git status
-git add -A
-git commit -m "refactor(simulation): Corretto21 fallback, RAM autosize, Bedrock checksum, systemd hardening, docs"
-```
-
-### 5) Rückweg bei Problemen
-
-```bash
-git restore -SW :/
-git reset --hard HEAD
-```
-
-### 6) Push und PR (optional)
-
-```bash
-git push -u origin copilot/refactor-sim
-gh pr create --fill --title "Refactor (simulation)" --body "Simulation-mode changes per COPILOT_RUN_INSTRUCTIONS.md"
-```
-
----
-
-## Hinweise
-
-* Keine lokalen Installationen anstoßen. Copilot erzeugt **nur** einen Diff.
-* In Antworten immer klarstellen: Beispiele dienen externer Ausführung.
-* Für Schritt-für-Schritt-Effekte der Skripte siehe `SIMULATION.md`.
-* CI-Erweiterungen (ShellCheck, Markdown-Lint, Link-Check) bitte in separatem PR ergänzen.
-
-
-::contentReference[oaicite:0]{index=0}
-
+# Copilot Instructions (AI Coding Agents)
+
+## Big Picture
+Dieses Repo sind defensive **Bash-Installer/Updater** für Minecraft auf Proxmox-Gästen:
+- **Java (PaperMC)**: Provisionierung nach `/opt/minecraft`, Start via `screen`.
+- **Bedrock**: Provisionierung nach `/opt/minecraft-bedrock`, Start via `screen`.
+- Optionaler Autostart über systemd (`minecraft.service`, `minecraft-bedrock.service`).
+
+## Simulation-Only (nicht ausführen)
+- **Keine Side-Effects** in dieser Workspace-Umgebung: kein `apt`, `systemctl`, `curl/wget` (wenn es Dinge installiert/ändert), keine `./setup_*.sh`.
+- Bei „run/build“ nur **Beispiel-Kommandos für externe Hosts** zeigen und kurz erklären. Siehe [SIMULATION.md](SIMULATION.md).
+- Für Copilot-CLI-/Diff-Workflow: [COPILOT_RUN_INSTRUCTIONS.md](COPILOT_RUN_INSTRUCTIONS.md).
+
+## Entry Points
+- Java VM Installer: `setup_minecraft.sh`
+- Java LXC Installer: `setup_minecraft_lxc.sh`
+- Bedrock Installer: `setup_bedrock.sh`
+- Java Updater: `update.sh`
+- systemd Units: `minecraft.service`, `minecraft-bedrock.service`
+- Doku: `README.md`, `SIMULATION.md`, `docs/BEDROCK_NETWORKING.md`
+
+## Repo-spezifische Patterns (bitte beibehalten)
+- Shell: `#!/usr/bin/env bash` + `set -euo pipefail` (z. B. in `setup_minecraft.sh`, `setup_bedrock.sh`).
+- Java 21: erst **OpenJDK 21**, Fallback auf **Amazon Corretto 21 via APT keyring + signed-by** (`ensure_java()` in `setup_minecraft.sh`).
+- JVM Autosize: aus `/proc/meminfo` → `-Xms ≈ RAM/4`, `-Xmx ≈ RAM/2`, Floors `1024M/2048M`, `Xmx`-Cap `≤16G` (generiertes `start.sh`).
+- PaperMC Integrität: PaperMC API (`curl`+`jq`) liefert SHA256; Download prüft SHA + Mindestgröße `>5MB` gegen HTML-Fehlerseiten (`setup_minecraft.sh`, `update.sh`).
+- Bedrock Integrität: Mojang-URL per Regex; **HTTP HEAD Content-Type** muss `application/zip|octet-stream` sein; Checksum standardmäßig **erzwingend** (`REQUIRE_BEDROCK_SHA=1`, `REQUIRED_BEDROCK_SHA256`) (`setup_bedrock.sh`).
+- screen Socket: `/run/screen` muss existieren (`root:utmp`, `0775`) und via `systemd-tmpfiles` persistiert werden, sonst scheitert `screen` auf Debian 12/13.
+- systemd Hardening: `minecraft.service` nutzt `User/Group=minecraft`, Hardening-Flags und `ReadWritePaths=/opt/minecraft`.
+
+## Änderungen am Repo
+- Minimal ändern, Stil beibehalten; keine neuen UX-Flows erfinden.
+- Neue Env-Variablen/Optionen immer kurz in `README.md` und/oder `SIMULATION.md` dokumentieren.
+- Keine Artefakte wie `*.bak`/`*.rej`/Report-Dateien einchecken (falls relevant: `.gitignore` ergänzen).
diff --git a/.gitignore b/.gitignore
index 19645fc..fa85fa2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,6 @@ fix_all_issues.sh
 vendor/bundle/
 .bundle/
 .npm-cache/
+*.bak
+*.rej
+shellcheck_report.txt
diff --git a/setup_minecraft.sh.bak b/setup_minecraft.sh.bak
deleted file mode 100755
index b4b09dc..0000000
--- a/setup_minecraft.sh.bak
+++ /dev/null
@@ -1,63 +0,0 @@
-#!/usr/bin/env bash
-
-# Minecraft Java Server Installer for Proxmox VM
-# Tested on Debian 11/12 and Ubuntu 24.04
-# Author: TimInTech
-
-set -euo pipefail  # Exit script on error, undefined variable, or failed pipeline
-
-# Install required dependencies
-sudo apt update && sudo apt upgrade -y
-sudo apt install -y screen wget curl jq unzip
-
-# Install Java: attempt to install OpenJDK 21 if available, otherwise fall back to OpenJDK 17.
-if ! sudo apt install -y openjdk-21-jre-headless; then
-  echo "openjdk-21-jre-headless is not available; falling back to openjdk-17-jre-headless"
-  sudo apt install -y openjdk-17-jre-headless
-fi
-
-# Set up server directory
-sudo mkdir -p /opt/minecraft
-sudo chown "$(whoami)":"$(whoami)" /opt/minecraft
-cd /opt/minecraft || exit 1
-
-# Fetch the latest PaperMC version
-LATEST_VERSION=$(curl -s https://api.papermc.io/v2/projects/paper | jq -r '.versions | last')
-LATEST_BUILD=$(curl -s https://api.papermc.io/v2/projects/paper/versions/"$LATEST_VERSION" | jq -r '.builds | last')
-
-# Validate if version and build numbers were retrieved
-if [[ -z "$LATEST_VERSION" || -z "$LATEST_BUILD" ]]; then
-  echo "ERROR: Unable to fetch the latest PaperMC version. Check https://papermc.io/downloads"
-  exit 1
-fi
-
-echo "📦 Downloading PaperMC - Version: $LATEST_VERSION, Build: $LATEST_BUILD"
-wget -O server.jar "https://api.papermc.io/v2/projects/paper/versions/$LATEST_VERSION/builds/$LATEST_BUILD/downloads/paper-$LATEST_VERSION-$LATEST_BUILD.jar"
-
-# Accept the Minecraft EULA
-echo "eula=true" > eula.txt
-
-# Create start script
-cat <<EOF > start.sh
-#!/bin/bash
-java -Xms2G -Xmx4G -jar server.jar nogui
-EOF
-chmod +x start.sh
-
-# Create update script
-cat <<EOF > update.sh
-#!/bin/bash
-cd /opt/minecraft || exit 1
-LATEST_VERSION=\$(curl -s https://api.papermc.io/v2/projects/paper | jq -r '.versions | last')
-LATEST_BUILD=\$(curl -s https://api.papermc.io/v2/projects/paper/versions/\$LATEST_VERSION | jq -r '.builds | last')
-
-wget -O server.jar "https://api.papermc.io/v2/projects/paper/versions/\$LATEST_VERSION/builds/\$LATEST_BUILD/downloads/paper-\$LATEST_VERSION-\$LATEST_BUILD.jar"
-echo "✅ Update complete."
-EOF
-chmod +x update.sh
-
-# Start server in detached screen session
-screen -dmS minecraft ./start.sh
-
-echo "✅ Minecraft Server setup complete!"
-echo "To access console: sudo -u $(whoami) screen -r minecraft"
diff --git a/setup_minecraft_lxc.sh.bak b/setup_minecraft_lxc.sh.bak
deleted file mode 100644
index cbe7427..0000000
--- a/setup_minecraft_lxc.sh.bak
+++ /dev/null
@@ -1,50 +0,0 @@
-#!/usr/bin/env bash
-
-# Minecraft Server Installer for LXC Containers on Proxmox
-# Tested on Debian 11/12 and Ubuntu 24.04
-# Author: TimInTech
-
-
-set -euo pipefail
-
-# Update package lists and install required dependencies
-apt update && apt upgrade -y
-apt install -y screen wget curl jq unzip
-
-# Install Java: try OpenJDK 21 if available, fall back to OpenJDK 17.
-if ! apt install -y openjdk-21-jre-headless; then
-  echo "openjdk-21-jre-headless is not available; falling back to openjdk-17-jre-headless"
-  apt install -y openjdk-17-jre-headless
-fi
-
-# Create the Minecraft server directory
-mkdir -p /opt/minecraft && cd /opt/minecraft || exit 1
-
-# Fetch the latest PaperMC version
-LATEST_VERSION=$(curl -s https://api.papermc.io/v2/projects/paper | jq -r '.versions | last')
-LATEST_BUILD=$(curl -s https://api.papermc.io/v2/projects/paper/versions/"$LATEST_VERSION" | jq -r '.builds | last')
-
-# Validate if the version and build exist
-if [[ -z "$LATEST_VERSION" || -z "$LATEST_BUILD" ]]; then
-  echo "ERROR: Couldn't retrieve the latest PaperMC version. Check https://papermc.io/downloads"
-  exit 1
-fi
-
-echo "Downloading PaperMC Version: $LATEST_VERSION, Build: $LATEST_BUILD"
-wget -O server.jar "https://api.papermc.io/v2/projects/paper/versions/$LATEST_VERSION/builds/$LATEST_BUILD/downloads/paper-$LATEST_VERSION-$LATEST_BUILD.jar"
-
-# Accept the EULA
-echo "eula=true" > eula.txt
-
-# Create start script
-cat <<EOF > start.sh
-#!/bin/bash
-java -Xms2G -Xmx4G -jar server.jar nogui
-EOF
-
-chmod +x start.sh
-
-# Start the server in a detached screen session
-screen -dmS minecraft ./start.sh
-
-echo "✅ Minecraft Server setup complete! Use 'screen -r minecraft' to access the console."