fix: integrate todo-codebase-compaction hook properly

- Import PreemptiveCompactionOptions type
- Export hook from hooks/index.ts
- Add todo-codebase-compaction to HookNameSchema
- Use todoCodebaseCompactionInjector when hook is enabled

assets/oh-my-opencode.schema.json

@@ -77,7 +77,8 @@
           "edit-error-recovery",
           "prometheus-md-only",
           "start-work",
-          "sisyphus-orchestrator"
+          "sisyphus-orchestrator",
+          "todo-codebase-compaction"
         ]
       }
     },