refactor: cleanup shared constants and add async SDK support for isCallerOrchestrator

- Use shared OPENCODE_STORAGE, MESSAGE_STORAGE, PART_STORAGE constants
- Make isCallerOrchestrator async with SDK fallback for beta
- Fix cache implementation using Symbol sentinel
- Update atlas hooks and sisyphus-junior-notepad to use async isCallerOrchestrator

src/hooks/atlas/tool-execute-after.ts

@@ -23,7 +23,7 @@ export function createToolExecuteAfterHandler(input: {
       return
     }
 
-    if (!isCallerOrchestrator(toolInput.sessionID)) {
+    if (!(await isCallerOrchestrator(toolInput.sessionID, ctx.client))) {
       return
     }