fix(plugin): scope OpenCode marker commands to the plugin's directory

dev/opencode-plugin.ts

@@ -9,18 +9,25 @@
 
 import type { Plugin } from "@opencode-ai/plugin";
 
-export default (async ({ $ }) => {
+export default (async ({ $, directory }) => {
   return {
     event: async ({ event }) => {
+      // `$` is the host's process-global Bun shell, shared by every plugin in
+      // the process. The promise-level `.cwd(directory)` on each command below
+      // is load-bearing: it pins the command to the directory this plugin
+      // instance was created for. Without it, the command runs in whatever the
+      // process-wide cwd happens to be at spawn time. Do not "simplify" to the
+      // instance-level `$.cwd(...)` — that mutates the shared default for every
+      // plugin in the host process.
       switch (event.type) {
         case "session.status":
-          await $`wt config state marker set ${'🤖'} || true`.quiet();
+          await $`wt config state marker set ${'🤖'} || true`.cwd(directory).quiet();
           break;
         case "session.idle":
-          await $`wt config state marker set ${'💬'} || true`.quiet();
+          await $`wt config state marker set ${'💬'} || true`.cwd(directory).quiet();
           break;
         case "session.deleted":
-          await $`wt config state marker clear || true`.quiet();
+          await $`wt config state marker clear || true`.cwd(directory).quiet();
           break;
       }
     },