docs: RELEASES.md frames the release as 10.0.0 — honest major (log format v2 forward-only); comment wording cleanup

src/db/generationStore.ts

@@ -953,7 +953,7 @@ export class GenerationStore {
   }): Promise<{ generation: number; timestamp: number }> {
     return this.withMutex(async () => {
       // A latched history-durability failure compromises the whole generation
-      // spine — refuse a transact too (advancing the manifest past stuck,
+      // chain — refuse a transact too (advancing the manifest past stuck,
       // un-durable single-op generations would be inconsistent). Same loud
       // error; self-clears when the pending tier drains.
       this.assertHistoryDurable()