Add support for SAM3

[giswqs]

Fix #426

[github-actions]

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[Copilot]

Pull request overview

This PR adds support for Segment Anything Model 3 (SAM3) to the segment-geospatial package by introducing a new SamGeo3 class and related utilities. The implementation follows a similar pattern to the existing SAM2 support but adapts it for SAM3's architecture and API.

Key Changes:

• Introduces SamGeo3 class with text-based prompt segmentation capabilities
• Adds device selection utility (get_device()) to support CUDA, MPS, and CPU
• Includes visualization utilities with perceptually uniform color generation

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 17 comments.

File	Description
samgeo/samgeo3.py	New module implementing SAM3 integration with methods for image segmentation, mask generation, and visualization
samgeo/common.py	Adds get_device() helper function for automatic device selection across different hardware
samgeo/init.py	Exports the new samgeo3 module to make SamGeo3 class available
pyproject.toml	Adds samgeo3 optional dependency group with sam3 package requirement

Comments suppressed due to low confidence (1)

samgeo/samgeo3.py:6

• Import of 'sys' is not used.

import sys

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[giswqs]

show_masks()

[giswqs]

generate_masks_by_boxes