feat(workers): Python skeleton + config + structlog

Plan 4 Phase A scaffolding. void-workers package at /workers/, sibling
of /lib/. pyproject.toml pins Python 3.12 with separate extras for
pdf / image / video / test.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

workers/pyproject.toml

@@ -0,0 +1,23 @@
+[project]
+name = "void-workers"
+version = "0.1.0"
+requires-python = ">=3.12"
+dependencies = [
+  "psycopg[binary,pool]>=3.2",
+  "structlog>=24.1",
+]
+
+[project.optional-dependencies]
+pdf = ["pdfplumber>=0.11", "pytesseract>=0.3.13", "pillow>=10.3"]
+image = ["pytesseract>=0.3.13", "pillow>=10.3"]
+video = ["yt-dlp>=2024.10.0", "faster-whisper>=1.0.3"]
+test = ["pytest>=8.0", "pytest-asyncio>=0.23"]
+all = ["void-workers[pdf,image,video,test]"]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["void_workers*"]