Docs: Update Pi image workflow, 16GB+ requirement

- rpi/README.md: 16GB+ SD card requirement, use pull-image.sh
- rpi/BUILD_IMAGE.md: Simplified steps using pull-image.sh
- pull-image.sh: Optional .zst.zip wrapper for GitHub releases

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

rpi/BUILD_IMAGE.md

@@ -98,7 +98,7 @@ This removes:
 
 The script validates all cleanup steps before finishing.
 
-## Step 9: Copy the Image
+## Step 9: Pull the Image
 
 Remove SD card, insert into your Linux machine:
 
@@ -106,23 +106,13 @@ Remove SD card, insert into your Linux machine:
 # Find the SD card device (CAREFUL!)
 lsblk
 
-# Copy (replace sdX with actual device, e.g., sda)
-sudo dd if=/dev/sdX of=stegasoo-rpi-$(date +%Y%m%d).img bs=4M status=progress
+# Pull image (auto-resizes to 16GB, compresses with zstd)
+sudo ./rpi/pull-image.sh /dev/sdX stegasoo-rpi-4.1.5.img.zst
 ```
 
-## Step 10: Shrink & Compress
+The script automatically resizes rootfs to 16GB, disables auto-expand, and compresses.
 
-```bash
-# Optional: Shrink image (saves space)
-wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
-chmod +x pishrink.sh
-sudo ./pishrink.sh stegasoo-rpi-*.img
-
-# Compress (zstd is faster than xz with similar ratio)
-zstd -19 -T0 stegasoo-rpi-*.img
-```
-
-## Step 11: Distribute
+## Step 10: Distribute
 
 Upload `.img.zst` to GitHub Releases.
 
@@ -191,7 +181,6 @@ sudo systemctl start stegasoo
 curl -k https://localhost:5000
 sudo /opt/stegasoo/rpi/sanitize-for-image.sh
 
-# On host (pull image):
-sudo dd if=/dev/sdX of=stegasoo-rpi-$(date +%Y%m%d).img bs=4M status=progress
-zstd -19 -T0 stegasoo-rpi-*.img
+# On host (pull image - auto-resizes to 16GB):
+sudo ./rpi/pull-image.sh /dev/sdX stegasoo-rpi-4.1.5.img.zst
 ```

rpi/README.md

@@ -32,7 +32,7 @@ cd stegasoo
 - Raspberry Pi 4 or 5
 - Raspberry Pi OS Lite (64-bit) - Bookworm or later
 - 4GB+ RAM recommended (2GB minimum)
-- ~2GB free disk space
+- 16GB+ SD card (pre-built images are 16GB)
 - Internet connection
 
 ### Performance
@@ -199,18 +199,15 @@ After Pi shuts down, remove SD card and on another Linux machine:
 # Find SD card device (BE CAREFUL - wrong device = data loss!)
 lsblk
 
-# Copy (replace sdX with your SD card)
-sudo dd if=/dev/sdX of=stegasoo-rpi-$(date +%Y%m%d).img bs=4M status=progress
-
-# Shrink the image (optional but recommended)
-wget https://raw.githubusercontent.com/Drewsif/PiShrink/master/pishrink.sh
-chmod +x pishrink.sh
-sudo ./pishrink.sh stegasoo-rpi-*.img
-
-# Compress (zstd is faster than xz with similar compression)
-zstd -19 -T0 stegasoo-rpi-*.img
+# Pull image (auto-resizes to 16GB, compresses with zstd)
+sudo ./rpi/pull-image.sh /dev/sdX stegasoo-rpi-4.1.5.img.zst
 ```
 
+The `pull-image.sh` script automatically:
+- Resizes rootfs to exactly 16GB (consistent image size)
+- Disables Pi OS auto-expand
+- Compresses with zstd for fast decompression
+
 ### 6. Distribute
 
 Upload the `.img.zst` file to GitHub Releases.

rpi/pull-image.sh

@@ -191,6 +191,22 @@ echo
 echo -e "${GREEN}Done!${NC} Image saved to: $OUTPUT"
 ls -lh "$OUTPUT"
 
+# ============================================================================
+# Optional: Zip-wrap for GitHub releases
+# ============================================================================
 echo
-echo "To verify:"
-echo "  zstdcat $OUTPUT | fdisk -l /dev/stdin"
+read -p "Create .zst.zip wrapper for GitHub? [y/N] " zip_confirm
+if [[ "$zip_confirm" =~ ^[Yy]$ ]]; then
+    ZIP_OUTPUT="${OUTPUT}.zip"
+    echo -e "${YELLOW}Creating zip wrapper (store mode, no compression)...${NC}"
+    zip -0 "$ZIP_OUTPUT" "$OUTPUT"
+    echo -e "${GREEN}Done!${NC} Upload this to GitHub Releases:"
+    ls -lh "$ZIP_OUTPUT"
+    echo
+    echo "Users can flash with:"
+    echo "  sudo ./rpi/flash-image.sh $ZIP_OUTPUT"
+else
+    echo
+    echo "To verify:"
+    echo "  zstdcat $OUTPUT | fdisk -l /dev/stdin"
+fi