feat: WP-0001 foundation + WP-0002 core extensions

WP-0001 — Foundation & GAAF Baseline
- SCOPE.md, ARCHITECTURE-LAYERS.md, contracts/ tree
- .claude/rules/ stubs filled (architecture, stack, boundary)
- 57 tests (pytest), pyproject.toml with ruff+mypy, CI workflow

WP-0002 — Core Extensions (FR-4 + FR-3)
- FR-4: BudgetTracker (thread-safe) + LLMBudgetExceededError +
  optional RunConfig.budget_tracker + enforcement in all adapters
- FR-3: async_execute_prompt on LLMAdapter ABC (asyncio.to_thread
  fallback) + native asyncio.create_subprocess_exec in ClaudeCodeAdapter

81 tests passing.

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

pyproject.toml

@@ -14,6 +14,8 @@ dependencies = [
 [project.optional-dependencies]
 dev = [
     "pytest>=7.0",
+    "ruff>=0.4",
+    "mypy>=1.10",
 ]
 
 [tool.setuptools.packages.find]
@@ -23,4 +25,26 @@ include = ["llm_connect*"]
 [dependency-groups]
 dev = [
     "pytest>=9.0.2",
+    "ruff>=0.4",
+    "mypy>=1.10",
 ]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-v"
+
+[tool.ruff]
+target-version = "py310"
+line-length = 100
+
+[tool.ruff.lint]
+select = ["E", "F", "W", "I", "UP"]
+ignore = ["E501"]
+
+[tool.mypy]
+python_version = "3.10"
+strict = false
+ignore_missing_imports = true
+disallow_untyped_defs = true
+warn_return_any = true
+warn_unused_ignores = true