Incorporate art-dag-mono repo into artdag/ subfolder

Merges full history from art-dag/mono.git into the monorepo
under the artdag/ directory. Contains: core (DAG engine),
l1 (Celery rendering server), l2 (ActivityPub registry),
common (shared templates/middleware), client (CLI), test (e2e).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

git-subtree-dir: artdag
git-subtree-mainline: 1a179de547
git-subtree-split: 4c2e716558

artdag/core/pyproject.toml

@@ -0,0 +1,62 @@
+[build-system]
+requires = ["setuptools>=61.0", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "artdag"
+version = "0.1.0"
+description = "Content-addressed DAG execution engine with ActivityPub ownership"
+readme = "README.md"
+license = {text = "MIT"}
+requires-python = ">=3.10"
+authors = [
+    {name = "Giles", email = "giles@rose-ash.com"}
+]
+keywords = ["dag", "content-addressed", "activitypub", "video", "processing"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Developers",
+    "License :: OSI Approved :: MIT License",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+dependencies = [
+    "cryptography>=41.0.0",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=7.0.0",
+    "pytest-asyncio>=0.21.0",
+]
+analysis = [
+    "librosa>=0.10.0",
+    "numpy>=1.24.0",
+    "pyyaml>=6.0",
+]
+cv = [
+    "opencv-python>=4.8.0",
+]
+all = [
+    "librosa>=0.10.0",
+    "numpy>=1.24.0",
+    "pyyaml>=6.0",
+    "opencv-python>=4.8.0",
+]
+
+[project.scripts]
+artdag = "artdag.cli:main"
+
+[project.urls]
+Homepage = "https://artdag.rose-ash.com"
+Repository = "https://github.com/giles/artdag"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["artdag*"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+python_files = ["test_*.py"]