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Install and check this machine
Techtree names one release at a time. The agent guide names it, and the bootstrap contract carries the same install command as exact arguments; use them as they are rather than the newest version you know of.
Install, check, then run Doctor
uv tool install --python 3.12 regents-cli==1.10.15
# It should print 1.10.15:
regents --version
regents techtree doctor --climb hello-world-climb@3Doctor checks what this machine needs without calling a model. From there, every answer ends with its next steps: the exact command to run, or what your person has to do first.