chore(packaging): MIT license + consolidate metadata into pyproject

- Add MIT LICENSE (PEP 639 'license = "MIT"' + license-files).
- Move all metadata into a [project] table (description, readme, authors,
  keywords, classifiers); drop the now-redundant setup.py.
- Declare bitarray and pycryptodome: used by pm3py.sim and the transponder
  crypto paths but previously undeclared, so a clean install failed on the
  README's own 'from pm3py.sim import SimSession'.
- gitignore build/ and dist/.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitignore

@@ -2,6 +2,8 @@ __pycache__/
 *.pyc
 *.egg-info/
 .pytest_cache/
+build/
+dist/
 venv/
 .venv/
 .worktrees/

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Dangerous Things
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

pyproject.toml

@@ -1,6 +1,50 @@
 [build-system]
-requires = ["setuptools"]
+requires = ["setuptools>=77.0.0"]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "pm3py"
+version = "0.1.0"
+description = "Pure-Python async client for the Proxmark3 NG wire protocol over USB serial."
+readme = "README.md"
+requires-python = ">=3.10"
+license = "MIT"
+license-files = ["LICENSE"]
+authors = [{ name = "Dangerous Things", email = "ops@dangerousthings.com" }]
+keywords = [
+    "proxmark3",
+    "rfid",
+    "nfc",
+    "iso14443",
+    "iso15693",
+    "mifare",
+    "ntag",
+    "t55xx",
+    "smartcard",
+]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Topic :: Security",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+]
+dependencies = [
+    "pyserial-asyncio>=0.6",
+    "bitarray>=2.0",
+    "pycryptodome>=3.10",
+]
+
+[project.optional-dependencies]
+dev = ["pytest"]
+
+[tool.setuptools.packages.find]
+include = ["pm3py*"]
+
 [tool.pytest.ini_options]
 testpaths = ["tests"]

setup.py

@@ -1,11 +0,0 @@
-from setuptools import setup, find_packages
-
-setup(
-    name="pm3py",
-    version="0.1.0",
-    packages=find_packages(),
-    install_requires=[
-        "pyserial-asyncio>=0.6",
-    ],
-    python_requires=">=3.10",
-)