Function discoverEmbedDbConfigCached

discoverEmbedDbConfigCached(
file: string,
expectedVaultRoot: string,
): Promise<EmbedDbConfigDiscovery>
Read the discriminated, root-scoped embedding configuration discovery through a bounded LRU cache. Entries are isolated by exact file/root tuple and invalidated when the main file's mtimeMs/size or the WAL sidecar's presence/mtimeMs/size changes. The returned owned metadata is cloned so callers cannot mutate a cached authority snapshot. Raw peek entries and other roots never share this cache keyspace. refused is never cached: transient open/read/close/permission uncertainty is re-probed on every call.

This remains pre-open guidance rather than bootstrap authority; every writable EmbedDb.open() repeats same-handle transactional admission.
Parameters
- file: string
  Absolute path to the candidate embedding database.
- expectedVaultRoot: string
  Exact vault root allowed to own a populated file.
Returns Promise<EmbedDbConfigDiscovery>
The same four-state result as discoverEmbedDbConfig.
Throws
If file does not end exactly in .embed.db.
Example
```
const discovery = await discoverEmbedDbConfigCached(embedFile, vault.root);
if (discovery.kind !== "owned") return [];
useStoredConfig(discovery.meta);
```
- Defined in src/embed-db.ts:4322