refactor: remove terminal title update feature

OpenCode now supports terminal title updates natively (since v1.0.150,
commit 8346550), making this plugin feature redundant. Remove the
entire terminal title feature and clean up associated dead code.

Ref: https://github.com/sst/opencode/commit/8346550

Removed:
- src/features/terminal/ (title.ts, index.ts)
- src/features/claude-code-session-state/detector.ts (dead code)
- src/features/claude-code-session-state/types.ts (dead code)
- Session title tracking (setCurrentSession, getCurrentSessionTitle)
- Terminal title update calls from event handlers

Retained:
- subagentSessions (used by background-agent, session-notification)
- mainSessionID tracking (used by session recovery)

🤖 Generated with [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/index.ts

@@ -39,12 +39,9 @@ import {
 } from "./features/claude-code-agent-loader";
 import { loadMcpConfigs } from "./features/claude-code-mcp-loader";
 import {
-  setCurrentSession,
   setMainSession,
   getMainSessionID,
-  getCurrentSessionTitle,
 } from "./features/claude-code-session-state";
-import { updateTerminalTitle } from "./features/terminal";
 import { builtinTools, createCallOmoAgent, createBackgroundTools, createLookAt, interactive_bash, getTmuxPath } from "./tools";
 import { BackgroundManager } from "./features/background-agent";
 import { createBuiltinMcps } from "./mcp";
@@ -252,8 +249,6 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
     ? createEmptyMessageSanitizerHook()
     : null;
 
-  updateTerminalTitle({ sessionId: "main" });
-
   const backgroundManager = new BackgroundManager(ctx);
 
   const backgroundNotificationHook = isHookEnabled("background-notification")
@@ -421,28 +416,6 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
           | undefined;
         if (!sessionInfo?.parentID) {
           setMainSession(sessionInfo?.id);
-          setCurrentSession(sessionInfo?.id, sessionInfo?.title);
-          updateTerminalTitle({
-            sessionId: sessionInfo?.id || "main",
-            status: "idle",
-            directory: ctx.directory,
-            sessionTitle: sessionInfo?.title,
-          });
-        }
-      }
-
-      if (event.type === "session.updated") {
-        const sessionInfo = props?.info as
-          | { id?: string; title?: string; parentID?: string }
-          | undefined;
-        if (!sessionInfo?.parentID) {
-          setCurrentSession(sessionInfo?.id, sessionInfo?.title);
-          updateTerminalTitle({
-            sessionId: sessionInfo?.id || "main",
-            status: "processing",
-            directory: ctx.directory,
-            sessionTitle: sessionInfo?.title,
-          });
         }
       }
 
@@ -450,11 +423,6 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
         const sessionInfo = props?.info as { id?: string } | undefined;
         if (sessionInfo?.id === getMainSessionID()) {
           setMainSession(undefined);
-          setCurrentSession(undefined, undefined);
-          updateTerminalTitle({
-            sessionId: "main",
-            status: "idle",
-          });
         }
       }
 
@@ -482,27 +450,6 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
               .catch(() => {});
           }
         }
-
-        if (sessionID && sessionID === getMainSessionID()) {
-          updateTerminalTitle({
-            sessionId: sessionID,
-            status: "error",
-            directory: ctx.directory,
-            sessionTitle: getCurrentSessionTitle(),
-          });
-        }
-      }
-
-      if (event.type === "session.idle") {
-        const sessionID = props?.sessionID as string | undefined;
-        if (sessionID && sessionID === getMainSessionID()) {
-          updateTerminalTitle({
-            sessionId: sessionID,
-            status: "idle",
-            directory: ctx.directory,
-            sessionTitle: getCurrentSessionTitle(),
-          });
-        }
       }
     },
 
@@ -522,16 +469,6 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
           ...(isExploreOrLibrarian ? { call_omo_agent: false } : {}),
         };
       }
-
-      if (input.sessionID === getMainSessionID()) {
-        updateTerminalTitle({
-          sessionId: input.sessionID,
-          status: "tool",
-          currentTool: input.tool,
-          directory: ctx.directory,
-          sessionTitle: getCurrentSessionTitle(),
-        });
-      }
     },
 
     "tool.execute.after": async (input, output) => {
@@ -545,15 +482,6 @@ const OhMyOpenCodePlugin: Plugin = async (ctx) => {
       await emptyTaskResponseDetector?.["tool.execute.after"](input, output);
       await agentUsageReminder?.["tool.execute.after"](input, output);
       await interactiveBashSession?.["tool.execute.after"](input, output);
-
-      if (input.sessionID === getMainSessionID()) {
-        updateTerminalTitle({
-          sessionId: input.sessionID,
-          status: "idle",
-          directory: ctx.directory,
-          sessionTitle: getCurrentSessionTitle(),
-        });
-      }
     },
   };
 };