Complete poetry to uv migration: fix test runner and workflow

[Copilot]

Incomplete migration from poetry to uv caused CI test failures (FileNotFoundError: 'poetry') and a workflow warning about an invalid os input parameter.

Changes

Test infrastructure:

• tests/helpers.py: Changed CTT_CMD from ['poetry', 'run', 'ctt'] to ['uv', 'run', 'ctt']

CI workflow (.github/workflows/usage_test.yml):

• Removed invalid os input parameter (not accepted by setup action)
• Changed command from poetry run ctt to uv run ctt
• Updated trigger paths from poetry.lock to uv.lock

Documentation:

• Updated example in docs/README.md from poetry run pytest to uv run pytest

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• astral.sh
  • Triggering command: /usr/bin/curl curl -LsSf REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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