Layer 1 core: Wright-Fisher knowledge-transmission model with E1-E2

Scaffold plus the Layer 1 analytical core and the first two experiments.

- knowledge/: truth, metrics, teachers (2.7.1 shared-switch construction),
  step, lineage, experiment, config, seeding (imported as `knowledge`).
- Validation spine green: neutral decay (Pred 1), fixation (Pred 2), exact
  mutation-drift equilibrium (Pred 3), union coverage (Pred 5). 68 tests pass.
- E1 reproduces tail-first collapse. E2 delivers the headline: a grounding
  phase boundary g* << 1, with stationary H tracking the exact H_eq closed
  form (g=0.005 -> 68% of truth diversity; g=0.05 -> 96%).
- Reproducibility: uv venv from a hash-pinned uv.lock is the source of truth;
  every run writes results.parquet + resolved_config.yaml + manifest.json
  (lib versions, git commit, sha256). Figures and manifests tracked; the
  large regenerable parquet is gitignored.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -0,0 +1,31 @@
+[project]
+name = "lamarckian-society"
+version = "0.1.0"
+description = "Layer 1 analytical core: knowledge transmission as a Wright-Fisher process."
+readme = "README.md"
+requires-python = ">=3.11"
+dependencies = [
+    "numpy>=1.26",
+    "scipy>=1.11",
+    "pandas>=2.1",
+    "pyarrow>=15",
+    "matplotlib>=3.8",
+    "pydantic>=2.5",
+    "pyyaml>=6.0",
+]
+
+[project.optional-dependencies]
+dev = ["pytest>=8.0"]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+# src-layout: src/knowledge/ is importable as `knowledge` (the normative package
+# name the scientific-validation conformance tests import).
+[tool.hatch.build.targets.wheel]
+packages = ["src/knowledge"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-q"