fix: address all Cubic P2 review issues

- session-utils: log SDK errors instead of silent swallow
- opencode-message-dir: fix indentation, improve error log format
- storage: use session.list for sessionExists (handles empty sessions)
- storage.test: use resetStorageClient for proper SDK client cleanup
- todo-sync: add content-based fallback for id-less todo removal

src/shared/session-utils.ts

@@ -1,22 +1,22 @@
 import { findNearestMessageWithFields, findNearestMessageWithFieldsFromSDK } from "../features/hook-message-injector"
 import { getMessageDir } from "./opencode-message-dir"
 import { isSqliteBackend } from "./opencode-storage-detection"
+import { log } from "./logger"
 import type { PluginInput } from "@opencode-ai/plugin"
 
 export async function isCallerOrchestrator(sessionID?: string, client?: PluginInput["client"]): Promise<boolean> {
   if (!sessionID) return false
 
-  // Beta mode: use SDK if client provided
   if (isSqliteBackend() && client) {
     try {
       const nearest = await findNearestMessageWithFieldsFromSDK(client, sessionID)
       return nearest?.agent?.toLowerCase() === "atlas"
-    } catch {
+    } catch (error) {
+      log("[session-utils] SDK orchestrator check failed", { sessionID, error: String(error) })
       return false
     }
   }
 
-  // Stable mode: use JSON files
   const messageDir = getMessageDir(sessionID)
   if (!messageDir) return false
   const nearest = findNearestMessageWithFields(messageDir)