Move server dependencies to optional extras

[tijmenstor]

Summary

• Move fastapi, pydantic, and uvicorn to [project.optional-dependencies] server
• Client package now only requires requests
• Example server script removed from default install (can still run via python -m devleaps.policies.example.main)

Motivation

The client only needs requests for HTTP calls. The server dependencies (especially pydantic-core which requires Rust compilation) add significant overhead for users who only need the client.

This change enables a much simpler Homebrew formula that doesn't require Rust/LLVM (~2GB) as build dependencies.

Migration

• pip install devleaps-agent-policies - installs client only
• pip install devleaps-agent-policies[server] - installs client + server dependencies

Test plan

• Verify client works with only requests installed
• Verify server works with [server] extras installed
• Update homebrew-brew formula after release

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[Copilot]

Pull request overview

This PR refactors the package structure to make server dependencies optional, reducing installation overhead for users who only need the client. The main change moves fastapi, pydantic, and uvicorn from required dependencies to optional [server] extras, while keeping only requests as a core dependency.

Changes:

• Moved server dependencies (fastapi, pydantic, uvicorn) to optional [server] extras in pyproject.toml
• Removed the devleaps-policy-example-server script entry point, replacing it with a comment documenting the manual invocation method

Comments suppressed due to low confidence (1)

pyproject.toml:38

• The dev optional dependencies should include the server extras since the test files import from devleaps.policies.example.main which requires fastapi, pydantic, and uvicorn. Without these dependencies, tests will fail with import errors. Consider either:

1. Adding the server dependencies to the dev extras (recommended): dev = ["httpx==0.28.1", "pytest==8.4.2", "fastapi==0.118.0", "pydantic==2.12.5", "uvicorn==0.37.0"]
2. Or referencing the server extra: Update documentation to specify that tests require pip install devleaps-agent-policies[dev,server]

dev = [
    "httpx==0.28.1",
    "pytest==8.4.2",
]

---

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[Copilot]

The README still references the removed devleaps-policy-example-server command in two places (lines 57 and 107). These should be updated to reflect the new installation and running instructions as documented in the comment on line 42 of pyproject.toml. Consider updating them to:

pip install devleaps-agent-policies[server]
python -m devleaps.policies.example.main

Suggested change

	# To run the example server: pip install devleaps-agent-policies[server] && python -m devleaps.policies.example.main
	# To run the example server:
	# pip install devleaps-agent-policies[server]
	# python -m devleaps.policies.example.main