fix(01): remove unused eslint-disable in save/db.ts

01-02's flat config does not enable no-console, so 01-03's directive
landed as a max-warnings=0 violation after parallel-wave merge.

src/save/db.ts

@@ -107,7 +107,6 @@ export async function openSaveDB(): Promise<SaveDB> {
     // will surface a "running on localStorage" notice when this path
     // triggers (per .planning/research/PITFALLS.md #8 multi-layer write
     // requirement).
-    // eslint-disable-next-line no-console
     console.warn(
       '[save] IndexedDB unavailable, falling back to localStorage:',
       err,