fix: yield results from _enumerate when metaOnly is true

[es617]

Problem

DirectFileManipulator._enumerate() silently returns zero results when called with metaOnly: true.

In an async * generator function, a bare return <value> doesn't yield anything to the caller — it just sets the generator's return value (which for await...of ignores). The current code returns the async iterator from findEntries() as a completion value instead of delegating to it.

// Before: returns the iterator as a value, yields nothing
async *_enumerate(startKey, endKey, opt) {
    if (opt.metaOnly) return this.liveSyncLocalDB.findEntries(startKey, endKey, {});
    // ...
}

This means enumerateAllNormalDocs({ metaOnly: true }) always produces an empty sequence.

Fix

// After: delegates to the iterator, yields all its values
if (opt.metaOnly) return yield* this.liveSyncLocalDB.findEntries(startKey, endKey, {});

yield* delegates to the inner async generator, forwarding all its values to the caller.

[es617]

Closing this — the original branch was based on an old commit. Reopened as #22 with the same one-line fix, now based on current main.