remove redundant marauder wrappers and anthropic dependency

memory.py and marauder_cart.py were subprocess wrappers around marauder
CLI — redundant now that the opencode chat agent has native EEMS tools.
Also remove custom TOOLS dict, EEMS context injection at session start,
marauder_cart.create() in calibration_done, and anthropic dep/env vars.
Inline slug() as _slug() in calibration.py.

pyproject.toml

@@ -7,7 +7,7 @@ dependencies = [
     "fastapi>=0.115",
     "uvicorn[standard]>=0.32",
     "websockets>=13",
-    "anthropic>=0.40",
+
     "authlib>=1.3",
     "itsdangerous>=2.2",        # session cookie signing
     "httpx>=0.27",              # for authlib OAuth