build: drop redundant .sparse.img generation and update docs

README.md

@@ -54,7 +54,7 @@ bananarchy/
 ├── MANUAL.md                              # Complete flashing, keypad, plugin, T9, camera, and modem manual
 ├── flash-edl.sh                           # Automated USB EDL flasher wrapper (sudo + ModemManager handling)
 ├── flash-edl.py                           # Multi-device Qualcomm Sahara/Firehose EDL flasher
-├── rebuild-image.sh                       # Builds boot.img, MBR raw .img, and Android .sparse.img
+├── rebuild-image.sh                       # Builds boot.img and partitioned MBR .img
 ├── chroot-shell.sh                        # Rootless Docker armv7 package & rootfs customization shell
 ├── artwork/                               # Bananarchy master icon, generated icons, wallpapers, and splashes
 ├── bootloader/                            # lk2nd secondary bootloader and Sahara/Firehose programmer (8110.mbn)
@@ -130,8 +130,7 @@ All components are pre-compiled in `prebuilt/` and `overlay/rootfs/`, and can be
 ./rebuild-image.sh nokia-sparkler --mkinitfs
 ```
 Output images are written to `images/`:
-- `images/bananarchy-<device>.img` (raw partitioned MBR image for EDL `userdata` or microSD card)
-- `images/bananarchy-<device>.sparse.img` (Android sparse image for `fastboot flash userdata`)
+- `images/bananarchy-<device>.img` (partitioned MBR image for EDL `userdata`, `fastboot flash userdata`, or microSD card)
 - `images/boot-bananarchy-<device>.img` (kernel + initramfs + DTB boot image)
 
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