docs(RMGR-WP-0001): complete T04 implementation foundation

Accept ADR-001: Python 3.12, FastAPI, Postgres/SQLAlchemy async, src layout,
uv/hatchling, pytest. Scaffold package, rmgr CLI stub, and version tests.

pyproject.toml

@@ -0,0 +1,45 @@
+[project]
+name = "repo-manager"
+version = "0.1.0"
+description = "HelixForge repository integration boundary"
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    "fastapi>=0.115.0",
+    "uvicorn[standard]>=0.32.0",
+    "sqlalchemy[asyncio]>=2.0.0",
+    "asyncpg>=0.30.0",
+    "alembic>=1.14.0",
+    "pydantic>=2.10.0",
+    "pydantic-settings>=2.7.0",
+    "httpx>=0.28.0",
+    "pyyaml>=6.0.0",
+    "python-dotenv>=1.0.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0.0",
+    "pytest-asyncio>=0.24.0",
+    "ruff>=0.8.0",
+    "aiosqlite>=0.20.0",
+]
+
+[project.scripts]
+rmgr = "repo_manager.cli:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/repo_manager"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+pythonpath = ["src"]
+asyncio_mode = "auto"
+
+[tool.ruff]
+line-length = 100
+src = ["src", "tests"]