Add make target to lint only staged files

[mr-raj12]

The problem

Currently, running make lint executes uv run pre-commit run --all-files, which lints the entire codebase. While this is useful for comprehensive checks, it can be slow during active development when developers only want to lint their staged changes.

Although developers can run uv run pre-commit run directly to lint only staged files, this command is not documented in the Makefile help and is less discoverable for contributors.

Requested Solution

Add a new make lint-staged target to the Makefile:

lint-staged:  ## Run linting on staged files only
	uv run pre-commit run --show-diff-on-failure