fix: add prt_ prefix to part IDs for OpenCode 1.2.25+ compatibility

OpenCode 1.2.25+ validates part IDs with Zod schema requiring 'prt' prefix.
The chat.message hook was creating parts with non-compliant IDs causing ZodError.

Fixes #29

Author: NevermoreDDD

src/index.ts

@@ -112,7 +112,7 @@ export const SupermemoryPlugin: Plugin = async (ctx: PluginInput) => {
         if (detectMemoryKeyword(userMessage)) {
           log("chat.message: memory keyword detected");
           const nudgePart: Part = {
-            id: `supermemory-nudge-${Date.now()}`,
+            id: `prt_supermemory-nudge-${Date.now()}`,
             sessionID: input.sessionID,
             messageID: output.message.id,
             type: "text",
@@ -157,7 +157,7 @@ export const SupermemoryPlugin: Plugin = async (ctx: PluginInput) => {
 
           if (memoryContext) {
             const contextPart: Part = {
-              id: `supermemory-context-${Date.now()}`,
+              id: `prt_supermemory-context-${Date.now()}`,
               sessionID: input.sessionID,
               messageID: output.message.id,
               type: "text",