remove mcp file from session namespace

- Remove mcp from session file list and read handler
- Remove mcp from ctl command list
- Remove mcp from server.go mode switch
- Update README: remove mcp from file table and ctl docs

README.md

@@ -59,7 +59,6 @@ ollie/
       cwdwait           read:  blocks until cwd changes; returns new value
       fifo.in           write: queue a prompt for later execution
       fifo.out          read:  pop the next queued prompt
-      mcp               read:  MCP server list
       model             r/w:   active model name
       models            read:  available models from the backend
       prompt            write: submit a prompt to the agent
@@ -164,7 +163,7 @@ echo "rn my-name" > $OLLIE/s/<session-id>/ctl
 echo "model qwen3:8b" > $OLLIE/s/<session-id>/ctl
 ```
 
-`ctl` accepts only recognized commands: `stop`, `kill`, `rn <name>`, `compact`, `clear`, `backend`, `model`, `models`, `agents`, `agent`, `sessions`, `cwd`, `skills`, `tools`, `mcp`, `context`, `usage`, `history`, `irw`, `help`. The `/` prefix is added automatically. Unrecognized input is rejected with an error.
+`ctl` accepts only recognized commands: `stop`, `kill`, `rn <name>`, `compact`, `clear`, `backend`, `model`, `models`, `agents`, `agent`, `sessions`, `cwd`, `skills`, `tools`, `context`, `usage`, `history`, `irw`, `help`. The `/` prefix is added automatically. Unrecognized input is rejected with an error.
 
 ### Switch backend, model, or agent
 

internal/p9/server.go

@@ -22,7 +22,7 @@
 //	            agent       (r/w)   active agent name
 //	            model       (r/w)   active model name
 //	            models      (read)  available models from the backend
-//	            mcp         (read)  MCP server list
+//	            models      (read)  available models
 //	            cwd         (r/w)   working directory
 //	            usage       (read)  token counts
 //	            ctxsz       (read)  context size vs window
@@ -1564,7 +1564,7 @@ func (s *Server) makeStat(path string) plan9.Dir {
 		switch base {
 		case "ctl", "prompt", "fifo.in":
 			mode = 0200
-		case "chat", "state", "usage", "ctxsz", "models", "mcp", "fifo.out":
+		case "chat", "state", "usage", "ctxsz", "models", "fifo.out":
 			mode = 0444
 		case "backend", "agent", "model", "cwd":
 			mode = 0666

internal/p9/sessionfilestore.go

@@ -35,7 +35,6 @@ var sessionFileList = []struct {
 	{"ctxsz", 0444},
 	{"ctxszwait", 0444},
 	{"models", 0444},
-	{"mcp", 0444},
 	{"systemprompt", 0444},
 	{"params", 0666},
 }
@@ -260,8 +259,6 @@ func (s *SessionFileStore) content(name string) string {
 		return s.sess.core.CtxSz() + "\n"
 	case "models":
 		return s.sess.core.ListModels() + "\n"
-	case "mcp":
-		return s.sess.core.ListServers() + "\n"
 	case "systemprompt":
 		return s.sess.core.SystemPrompt()
 	case "offset":
@@ -366,7 +363,7 @@ func (s *SessionFileStore) handleCtl(input string) error {
 		return s.saveTranscript(data)
 	case "compact", "clear", "backend", "model", "models",
 		"agents", "agent", "sessions", "cwd", "skills",
-		"tools", "mcp", "context", "usage", "history",
+		"tools", "context", "usage", "history",
 		"irw", "help":
 		s.sess.core.Submit(s.sess.ctx, "/"+input, s.makePublish())
 	default: