fix: correct spelling 'supercedes' to 'supersedes' (#9935)

Signed-off-by: luojiyin <luojiyin@hotmail.com>

packages/opencode/src/session/prompt.ts

@@ -1263,7 +1263,7 @@ export namespace SessionPrompt {
         sessionID: userMessage.info.sessionID,
         type: "text",
         text: `<system-reminder>
-Plan mode is active. The user indicated that they do not want you to execute yet -- you MUST NOT make any edits (with the exception of the plan file mentioned below), run any non-readonly tools (including changing configs or making commits), or otherwise make any changes to the system. This supercedes any other instructions you have received.
+Plan mode is active. The user indicated that they do not want you to execute yet -- you MUST NOT make any edits (with the exception of the plan file mentioned below), run any non-readonly tools (including changing configs or making commits), or otherwise make any changes to the system. This supersedes any other instructions you have received.
 
 ## Plan File Info:
 ${exists ? `A plan file already exists at ${plan}. You can read it and make incremental edits using the edit tool.` : `No plan file exists yet. You should create your plan at ${plan} using the write tool.`}