build(fase1): add dev orchestration + solver + async deps, scaffold spikes

pyproject.toml

@@ -20,6 +20,10 @@ dev = [
     "pytest>=8",
     "ruff>=0.6",
     "mypy>=1.11",
+    # Fase 1 throwaway de-risk spikes (dev-only — NEVER shipped in the wheel; safe to delete).
+    "agent-framework-orchestrations>=1.0.0",  # GA orchestration builders (GroupChat/Concurrent/Magentic); resolves with core 1.9.0
+    "pulp>=2.8",                              # Spike C solver — PuLP bundles a CBC binary in its wheel (R2)
+    "pytest-asyncio>=0.24",                   # MAF orchestrations are async (await workflow.run(...))
 ]
 
 [build-system]
@@ -31,8 +35,9 @@ packages = ["src/portfolio_optimiser"]
 
 [tool.ruff]
 line-length = 100
-src = ["src", "tests"]
+src = ["src", "tests", "spikes"]
 
 [tool.pytest.ini_options]
-pythonpath = ["src"]
+pythonpath = ["src", "."]
 testpaths = ["tests"]
+asyncio_mode = "auto"