feat: scaffold Brain of Reese — FastAPI RAG chat over Postgres 17 + pgvector

Foundation (phase 01, verified):
- FastAPI app: /api/health, /api/suggestions, /api/chat (placeholder),
  static frontend served locally (no CDN)
- Postgres 17 + pgvector via db/Containerfile + compose.yaml
  (podman compose up -d db), Alembic initial migration (documents,
  chunks with vector(768), query_log)
- LLM client targeting https://aipi.reeseapps.com/v1 (turbo/embed);
  scripts/llm_probe.py verified models + 768-dim embeddings live
- Conditional debugpy: imported only when DEBUGPY=1 (attach on demand,
  :5678); logging config for clean single-line logs
- Frontend shell: mobile-first chat + Sources pages, tokens, a11y baselines
- Tests: 24 unit+integration (99% coverage on app/), ruff + pyright clean,
  Playwright smoke E2E (3 tests) against a deterministic mock LLM
- Planning: .agent/PLAN.md (architecture + LOCKED decisions), AGENTS.md,
  6 user stories, 7 phase files (one story / one phase / one Playwright
  suite each)

pyproject.toml

@@ -0,0 +1,49 @@
+[project]
+name = "brain-of-reese"
+version = "0.1.0"
+description = "Brain of Reese — a chippy RAG chatbot that answers questions about Reese's Homelab and Deployments, powered by self-hosted models."
+readme = "README.md"
+requires-python = ">=3.12"
+dependencies = [
+    # --- Web framework ---
+    "fastapi>=0.115,<1.0",
+    "uvicorn[standard]>=0.30,<1.0",
+    "pydantic>=2.7,<3.0",
+    "pydantic-settings>=2.3,<3.0",
+    "python-dotenv>=1.0,<2.0",
+    # --- Database (PostgreSQL 17 + pgvector) ---
+    "sqlalchemy>=2.0,<2.1",
+    "alembic>=1.13,<2.0",
+    "psycopg[binary]>=3.1,<4.0",
+    "pgvector>=0.3,<1.0",
+    # --- LLM client (OpenAI-compatible, self-hosted "aipi") ---
+    "httpx>=0.27,<1.0",
+    "openai>=1.40,<3.0",
+]
+
+[dependency-groups]
+dev = [
+    "debugpy>=1.8",
+    "ruff>=0.5",
+    "pyright>=1.1",
+    "pytest>=8.2",
+    "pytest-cov>=5.0",
+    "playwright>=1.45",
+]
+
+[tool.ruff]
+line-length = 100
+target-version = "py312"
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I", "UP", "B", "SIM"]
+
+[tool.pyright]
+pythonVersion = "3.12"
+typeCheckingMode = "standard"
+include = ["app", "scripts", "alembic", "tests"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests/unit", "tests/integration"]
+pythonpath = ["."]
+addopts = "-q"