Add 4.1.1 release notes

RELEASE-4.1.1.md

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+# Stegasoo 4.1.1 Release Notes
+
+**Release Date:** January 5, 2026
+
+## Highlights
+
+- **Reed-Solomon Error Correction** - DCT steganography now includes RS error correction, making encoded images more resilient to minor corruption and compression artifacts
+- **Completely Rewritten Pi Setup** - Fresh install tested and validated, works reliably from scratch
+- **SSH Login Banner** - See your Stegasoo URL immediately on SSH login
+
+## New Features
+
+### Reed-Solomon Error Correction
+DCT-encoded images now include Reed-Solomon error correction codes, allowing recovery from minor image corruption. This significantly improves reliability when images are shared through platforms that may slightly modify them.
+
+### SSH Login Banner (MOTD)
+When you SSH into your Stegasoo Pi, you'll now see:
+```
+  ___  _____  ___    ___    _    ___    ___    ___
+ / __||_   _|| __|  / __|  /_\  / __|  / _ \  / _ \
+ \__ \  | |  | _|  | (_ | / _ \ \__ \ | (_) || (_) |
+ |___/  |_|  |___|  \___//_/ \_\|___/  \___/  \___/
+
+ ● Stegasoo is running
+   https://192.168.0.4
+```
+
+### Elapsed Time Counter
+Encode/decode buttons now show elapsed time during operations.
+
+### Click-to-Copy Decoded Message
+Click the decoded message box to copy to clipboard (no button needed).
+
+### Overclock Wizard Option
+First-boot wizard now offers optional CPU overclocking for Pi 4/5 with active cooling.
+
+## Improvements
+
+### Setup Script (setup.sh)
+- Fixed pyenv Python path resolution (handles 3.12 → 3.12.12 mapping)
+- Changed default install location to `/opt/stegasoo`
+- Fixed jpegio build order (clone stegasoo first, then build jpegio into venv)
+- Added python3-dev to dependencies
+- Added btop for system monitoring
+- Shows `/setup` URL at completion for admin account creation
+
+### Sanitize Script
+- Now clears port 443 iptables redirect (clean slate for wizard)
+- Removes overclock settings before imaging
+
+### Documentation
+- Updated all docs to reference `/opt/stegasoo` path
+- Added pre-setup steps (chown /opt, install git)
+- Added Pi 4 performance baseline (~60s for 10MB JPEG)
+
+### About Page
+- Redesigned "Limits & Specs" section with key stats cards and accordion
+
+## Bug Fixes
+
+- Fixed DCT steganography for non-8-aligned images
+- Fixed MOTD port detection (was using iptables which requires root)
+- Fixed smoke test `--443` flag parsing
+
+## Performance
+
+On a Raspberry Pi 4 at 2GHz with USB 3.0 NVMe:
+- ~50 seconds to encode a 10MB JPEG
+- ~60 seconds to decode a 10MB JPEG
+- Full encryption: passphrase + PIN + reference photo
+
+## Upgrade Notes
+
+If upgrading from 4.1.0:
+```bash
+cd /opt/stegasoo  # or ~/stegasoo
+git pull origin 4.1
+```
+
+For fresh installs, see the [Pi README](rpi/README.md).
+
+## Pre-built Images
+
+- `stegasoo-rpi-4.1.1_20260105-2.img.zst` - Raspberry Pi 4/5 image
+
+Flash with:
+```bash
+zstdcat stegasoo-rpi-4.1.1_20260105-2.img.zst | sudo dd of=/dev/sdX bs=4M status=progress
+```
+
+---
+
+Full changelog: [v4.1.0...v4.1.1](https://github.com/adlee-was-taken/stegasoo/compare/v4.1.0...v4.1.1)