Migrate from Hatch to UV build system

[Copilot]

Replaces Hatch with UV for build and dependency management, aligning with the POCS repository pattern and adopting modern PEP 735 dependency groups.

Build System

• pyproject.toml: Switched from hatchling to setuptools + setuptools-scm for building
• Version management: Now uses setuptools-scm with auto-generated _version.py files
• Dependency groups: Migrated testing dependencies from [project.optional-dependencies] to [dependency-groups] for modern dependency management

# Before (Hatch)
[tool.hatch.envs.default]
dependencies = ["ruff>=0.5.0"]

[tool.hatch.envs.default.scripts]
lint = "ruff check ."

# After (UV)
[dependency-groups]
lint = ["ruff>=0.5.0"]

Workflows

• CI/CD: Updated GitHub Actions to use uv sync --group <group> and uv run <command>
• Release: Changed hatch build to uv build

Developer Experience

Commands updated throughout documentation (README, AGENTS.md, copilot-instructions):

# Before
hatch run pytest
hatch run lint
hatch build

# After
uv run pytest
uv run ruff check .
uv build

Cleanup

• Removed click<8.3 version pin (was Hatch-specific compatibility workaround)
• Added _version.py to .gitignore and ruff exclusions
• Generated uv.lock for reproducible dependency resolution

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)

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.11%. Comparing base (dad8fbd) to head (0d2f25c).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #332   +/-   ##
========================================
  Coverage    85.11%   85.11%           
========================================
  Files           21       21           
  Lines         1344     1344           
========================================
  Hits          1144     1144           
  Misses         200      200           

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[wtgee]

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