docs: improve onboarding

Onboarding was not very user-friendly and could be way easier.
New contributors were hitting walls trying to get the project running locally.

What got fixed:
- Made `make install` actually work reliably in one shot
- Added `make help` with proper descriptions to all targets so people know what commands exist
- Rewrote the README setup section to be way clearer

Author: PrettyWood

Makefile

@@ -15,49 +15,49 @@ USE_MATURIN = $(shell [ "$$VIRTUAL_ENV" != "" ] && (which maturin))
 	@uv -V || echo 'Please install uv: https://docs.astral.sh/uv/getting-started/installation/'
 
 .PHONY: .pre-commit  ## Check that pre-commit is installed
-.pre-commit:
-	@pre-commit -V || echo 'Please install pre-commit: https://pre-commit.com/'
+.pre-commit: .uv
+	@uv run pre-commit -V || uv pip install pre-commit
 
-.PHONY: install
+.PHONY: install  ## Install the package, dependencies, and pre-commit for local development
 install: .uv .pre-commit
-	uv pip install -U wheel
 	uv sync --frozen --group all
-	uv pip install -v -e .
-	pre-commit install
+	uv pip install pre-commit
+	uv run pre-commit install --install-hooks
 
 .PHONY: rebuild-lockfiles  ## Rebuild lockfiles from scratch, updating all dependencies
 rebuild-lockfiles: .uv
 	uv lock --upgrade
 
-.PHONY: install-rust-coverage
+.PHONY: install-rust-coverage  ## Install Rust coverage tools
 install-rust-coverage:
 	cargo install rustfilt coverage-prepare
 	rustup component add llvm-tools-preview
 
-.PHONY: install-pgo
+.PHONY: install-pgo  ## Install Rust PGO tools
+install-pgo:
 	rustup component add llvm-tools-preview
 
-.PHONY: build-dev
+.PHONY: build-dev  ## Build the development version of the package
 build-dev:
 	@rm -f python/pydantic_core/*.so
 	uv run maturin develop --uv
 
-.PHONY: build-prod
+.PHONY: build-prod  ## Build the production version of the package
 build-prod:
 	@rm -f python/pydantic_core/*.so
 	uv run maturin develop --uv --release
 
-.PHONY: build-profiling
+.PHONY: build-profiling  ## Build the profiling version of the package
 build-profiling:
 	@rm -f python/pydantic_core/*.so
 	uv run maturin develop --uv --profile profiling
 
-.PHONY: build-coverage
+.PHONY: build-coverage  ## Build the coverage version of the package
 build-coverage:
 	@rm -f python/pydantic_core/*.so
 	RUSTFLAGS='-C instrument-coverage' uv run maturin develop --uv --release
 
-.PHONY: build-pgo
+.PHONY: build-pgo  ## Build the PGO version of the package
 build-pgo:
 	@rm -f python/pydantic_core/*.so
 	$(eval PROFDATA := $(shell mktemp -d))
@@ -69,44 +69,44 @@ build-pgo:
 	@rm -rf $(PROFDATA)
 
 
-.PHONY: build-wasm
+.PHONY: build-wasm  ## Build the WebAssembly version of the package
 build-wasm:
 	@echo 'This requires python 3.12, maturin and emsdk to be installed'
 	uv run maturin build --release --target wasm32-unknown-emscripten --out dist -i 3.12
 	ls -lh dist
 
-.PHONY: format
+.PHONY: format  ## Auto-format rust and python source files
 format:
 	uv run ruff check --fix $(sources)
 	uv run ruff format $(sources)
 	cargo fmt
 
-.PHONY: lint-python
+.PHONY: lint-python  ## Lint python source files
 lint-python:
 	uv run ruff check $(sources)
 	uv run ruff format --check $(sources)
 	uv run griffe dump -f -d google -LWARNING -o/dev/null python/pydantic_core
 	$(mypy-stubtest)
 
-.PHONY: lint-rust
+.PHONY: lint-rust  ## Lint rust source files
 lint-rust:
 	cargo fmt --version
 	cargo fmt --all -- --check
 	cargo clippy --version
 	cargo clippy --tests -- -D warnings
 
-.PHONY: lint
+.PHONY: lint  ## Lint rust and python source files
 lint: lint-python lint-rust
 
-.PHONY: pyright
+.PHONY: pyright  ## Perform type-checking with pyright
 pyright:
 	uv run pyright
 
-.PHONY: test
+.PHONY: test  ## Run all tests
 test:
 	uv run pytest
 
-.PHONY: testcov
+.PHONY: testcov  ## Run tests and generate a coverage report
 testcov: build-coverage
 	@rm -rf htmlcov
 	@mkdir -p htmlcov
@@ -115,10 +115,10 @@ testcov: build-coverage
 	coverage html -d htmlcov/python
 	coverage-prepare html python/pydantic_core/*.so
 
-.PHONY: all
+.PHONY: all  ## Run the standard set of checks performed in CI
 all: format build-dev lint test
 
-.PHONY: clean
+.PHONY: clean  ## Clear local caches and build artifacts
 clean:
 	rm -rf `find . -name __pycache__`
 	rm -f `find . -type f -name '*.py[co]' `
@@ -133,3 +133,10 @@ clean:
 	rm -rf build
 	rm -rf perf.data*
 	rm -rf python/pydantic_core/*.so
+
+.PHONY: help  ## Display this message
+help:
+	@grep -E \
+		'^.PHONY: .*?## .*$$' $(MAKEFILE_LIST) | \
+		sort | \
+		awk 'BEGIN {FS = ".PHONY: |## "}; {printf "\033[36m%-19s\033[0m %s\n", $$2, $$3}'

README.md

@@ -69,35 +69,48 @@ except ValidationError as e:
 
 ## Getting Started
 
-You'll need rust stable [installed](https://rustup.rs/), or rust nightly if you want to generate accurate coverage.
+### Prerequisites
 
-With rust and python 3.9+ installed, compiling pydantic-core should be possible with roughly the following:
+You'll need:
+1. **[uv](https://docs.astral.sh/uv/getting-started/installation/)** - Fast Python package manager
+2. **[Rust](https://rustup.rs/)** - Rust stable (or nightly for coverage)
+3. **Python 3.9+**
+
+### Quick Start
 
 ```bash
-# clone this repo or your fork
+# Clone the repository
 git clone [email protected]:pydantic/pydantic-core.git
 cd pydantic-core
-# create a new virtual env
-python3 -m venv env
-source env/bin/activate
-# install dependencies and install pydantic-core
+
+# One command to set up everything!
 make install
 ```
 
-That should be it, the example shown above should now run.
+That's it! 🎉 The `make install` command will:
+- Install all dependencies using uv
+- Set up pre-commit hooks
+- Build the development version
+- Make the example above ready to run
+
+### Development Commands
+
+Run `make help` to see all available commands, or use these common ones:
+
+```bash
+make build-dev    # Build for development
+make test         # Run tests
+make lint         # Check code style
+make format       # Auto-format code
+make testcov      # Run tests with coverage
+make all          # Run format + build + lint + test
+```
 
-You might find it useful to look at [`python/pydantic_core/_pydantic_core.pyi`](./python/pydantic_core/_pydantic_core.pyi) and
-[`python/pydantic_core/core_schema.py`](./python/pydantic_core/core_schema.py) for more information on the python API,
-beyond that, [`tests/`](./tests) provide a large number of examples of usage.
+### Useful Resources
 
-If you want to contribute to pydantic-core, you'll want to use some other make commands:
-* `make build-dev` to build the package during development
-* `make build-prod` to perform an optimised build for benchmarking
-* `make test` to run the tests
-* `make testcov` to run the tests and generate a coverage report
-* `make lint` to run the linter
-* `make format` to format python and rust code
-* `make` to run `format build-dev lint test`
+* [`python/pydantic_core/_pydantic_core.pyi`](./python/pydantic_core/_pydantic_core.pyi) - Python API types
+* [`python/pydantic_core/core_schema.py`](./python/pydantic_core/core_schema.py) - Core schema definitions
+* [`tests/`](./tests) - Comprehensive usage examples
 
 ## Profiling