chore: scaffold pf1e_simulator package (uv, ruff, basedpyright, pytest)

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

pyproject.toml

@@ -0,0 +1,53 @@
+[project]
+name = "pf1e-simulator"
+version = "0.1.0"
+requires-python = ">=3.12"
+dependencies = [
+    "pydantic>=2",
+    "pyyaml",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/pf1e_simulator"]
+
+[dependency-groups]
+dev = [
+    "pytest",
+    "ruff",
+    "basedpyright",
+]
+
+# ── Ruff ──────────────────────────────────────────────────────────────────────
+[tool.ruff]
+target-version = "py312"
+line-length = 100
+
+[tool.ruff.lint]
+select = ["ALL"]
+ignore = [
+    # D: docstring rules — we don't write docstrings everywhere in early scaffolding
+    "D",
+    # COM812: trailing-comma-in-missing — conflicts with ruff formatter
+    "COM812",
+    # ISC001: single-line-implicit-string-concatenation — conflicts with formatter
+    "ISC001",
+    # CPY001: missing copyright notice — we don't use copyright headers
+    "CPY001",
+]
+
+[tool.ruff.lint.per-file-ignores]
+# Tests: assert is expected, magic numbers are fine, annotations are noisy
+"tests/**" = ["S101", "PLR2004", "ANN"]
+
+# ── Basedpyright ──────────────────────────────────────────────────────────────
+[tool.basedpyright]
+typeCheckingMode = "strict"
+include = ["src", "tests"]
+
+# ── Pytest ────────────────────────────────────────────────────────────────────
+[tool.pytest.ini_options]
+testpaths = ["tests"]