added support for the pixi python-packages manager

Author: xulman

pixi_env/.gitignore

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+.pixi
+pixi.lock

pixi_env/README.md

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+# Python environment managed by the pixi
+
+This is a Python-centered project, and naturaly comes with dependencies--additional packages.
+Clearly, there are several packages managers for Python. Some keep their environments outside
+the project tree (e.g. conda or mamba) and one has to remember which environment to activate;
+some keep the environment(s) inside the project tree and make it clear which environment to use.
+
+This folder here offers to control the dependecies with [the pixi](https://pixi.sh/) manager.
+
+
+# Using pixi with this project
+
+The pixi is controlled with `pixi.toml` configuration file, which ideally is kept synchronized
+with the requirements defined in the root folder.
+
+To start the (pixi-governed) environment in this folder:
+
+```bash
+cd path_to_this_repo/pixi_env
+pixi shell
+```
+
+or, to start it in the root folder:
+
+```bash
+cd path_to_this_repo
+pixi shell --manifest-path pixi_env/pixi.toml
+```
+
+Both examples normally give the conda/mamba-like-env-activated prompt... :+1:
+

pixi_env/pixi.toml

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+[workspace]
+name = "py-ctcmetrics"
+description = "Metrics for Cell Tracking Challenges"
+authors = ["Timo Kaiser <kaiser@tnt.uni-hannover.de>"]
+repository = "https://github.com/CellTrackingChallenge/py-ctcmetrics.git"
+version = "1.3.1"
+
+readme = "../README.md"
+license = "BSD-2-Clause"
+license-file = "../LICENSE.txt"
+
+platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"]
+channels = ["conda-forge"]
+
+[dependencies]
+numpy = ">=2.3.2,<3"
+scikit-learn = ">=1.7.1,<2"
+tifffile = ">=2025.8.28,<2026"
+imagecodecs = ">=2025.8.2,<2026"
+pandas = ">=2.3.2,<3"
+scipy = ">=1.16.1,<2"
+py-opencv = ">=4.12.0,<5"
+
+[pypi-dependencies]
+py-ctcmetrics = { path = "..", editable = true }