Converge manager out of product roles and drop dead inherit prefs.

Specialists-only binding/prewarm/MCP allowlists fold legacy manager aliases into generalist; stop persisting confirm/plan prefs and strip inherit from prompt signatures.

Co-authored-by: Cursor <cursoragent@cursor.com>

runtime/agent_context/loader.py

@@ -24,8 +24,8 @@ def _read_text(path: Path) -> str:
 
 def _workspace_for_role(role: str) -> str:
     r = str(role or "").strip().lower()
-    if r == "manager":
-        return "main"
+    if r in {"manager", "manager_self", "main"}:
+        return "generalist"
     return r or "generalist"