lucida-remove-backgroundlisted

# Lucida Background Removal Use the `bgr` executable from `egeorcun/lucida`. Preserve the source image and create a separate transparent PNG. ## Workflow 1. Resolve the input image and confirm it exists. 2. Use the user's output path when provided. Otherwise, write `<input-stem>-transparent.png` beside the input. Do not overwrite the source unless the user explicitly requests it. 3. Check whether `bgr` is available: ```text bgr --help ``` **Note:** If the current environment is sandboxed (for example: Codex sandbox), run all `bgr` commands in the user's normal terminal. Otherwise the `bgr --help` command process might be freezed or timeout. 4. If `bgr` is missing, verify that `uv` is available and install the CLI: ```text uv tool install --from git+https://github.com/egeorcun/lucida.git my-bg-remover ``` The package requires Python 3.12 or newer. The installation exposes one executable: `bgr`. 5. Select the model: - Use `lucida` by default, especially for glass, partial transparency, smoke, glow, VFX, camouflage, text or logos with soft shadows, line art, illustrations, and print or sticker designs. - Use `birefnet-hr` for high-resolution general segmentation, especially solid physical subjects, product photos, or when Lucida keeps unwanted low-alpha background haze. Expect higher compute and memory use because it processes at 2048×2048. - Read [references/models.md](references/models.md) only when an alternate model, a versioned loc