Add Makefile for development and release workflow

[kacy]

Summary

Adds a Makefile to streamline common development tasks and the release process.

Available Targets

Development

Target	Description
make build	Build the library
make test	Run all tests
make lint	Run clippy + format check
make fmt	Format code
make check	Run all checks (lint, build, test)
make clean	Clean build artifacts
make doc	Generate documentation
make doc-open	Generate and open docs in browser

Release

Target	Description
make version	Show current version
make release-patch	Bump patch version (0.1.2 -> 0.1.3)
make release-minor	Bump minor version (0.1.2 -> 0.2.0)
make release-major	Bump major version (0.1.2 -> 1.0.0)
make publish-dry	Test publish without uploading
make publish	Publish to crates.io

Usage

# Run all checks before committing
make check

# Release workflow
make release-patch
git add Cargo.toml && git commit -m "Bump version"
git push
make publish

Test plan

• make help displays all targets
• make build compiles successfully
• make test runs all tests

🤖 Generated with Claude Code