feat: add oasis and river ecosystem simulation examples#27
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Add two rich simulation examples with video output: - Oasis: three oases (Large Sparse, Medium Normal, Small Dense) on a desert map to observe how different food densities drive trait evolution - River: river with tributaries where food concentrates near water, testing if proximity to resources drives body size evolution Both examples include per-zone trait comparison charts (size, speed, awareness) and generate MP4 videos from rendered frames. Also fix a boundary clamp bug in Environment::updatePositionsInSpatialIndex where organisms at the map edge could land exactly on width/height, causing OutOfRangeException with the quadtree spatial index (half-open interval [0, size)). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
examples/oasis_video.py): three oases with different sizes/densities on a 5000x5000 desert map, 600 generations with per-zone trait comparisonexamples/river_video.py): river with tributaries on a 10000x10000 map, food concentrated near water, 800 generations with zone-based analysisEnvironment::updatePositionsInSpatialIndex— organisms at map edge could hit exact width/height, causingOutOfRangeExceptionwith quadtree spatial index (half-open interval[0, size))Test plan
cmake -S . -B build -DBUILD_TESTS=ON -DBUILD_BINDINGS=OFF && cmake --build build && cd build && ctest -Vpytestpython examples/oasis_video.py— generates video inoasis_output/python examples/river_video.py— generates video inriver_output/🤖 Generated with Claude Code