#11113: fix(memory-lancedb): preserve error cause in LanceDB load failure

Fixes lint error on `main` - the `preserve-caught-error` rule requires the original error to be attached via `cause` when re-throwing. ### Changes - Adds `{ cause: err }` to the `Error` constructor in `loadLanceDB()` ### Testing - `pnpm lint` passes locally ### AI-assisted Built with Claude. Lightly tested (lint only). <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the LanceDB plugin’s lazy import error handling to comply with the `preserve-caught-error` lint rule by rethrowing with an `Error` that includes the original exception as `cause`. The change is localized to `extensions/memory-lancedb/index.ts` in `loadLanceDB()`, which wraps failures from `import("@lancedb/lancedb")` (commonly missing native bindings) so downstream callers see a consistent plugin-scoped error message while still preserving the underlying error for debugging. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk. - The change is a single-line update that adds an error `cause` when rethrowing in `loadLanceDB()`, aligning with lint requirements and improving debuggability without affecting control flow or external interfaces. - No files require special attention <!-- greptile_other_comments_section --> _{(4/5) You can add custom instructions or style guidelines for the agent [here](https://app.greptile.com/review/github)!} <!-- /greptile_comment -->