chore: test simulation cache with native sqlite

[deepak1556]

No description provided.

[Copilot]

Pull request overview

This PR updates the Copilot simulation test cache implementation to stop relying on native sqlite3 via keyv/@keyv/sqlite, and instead use Node’s built-in node:sqlite APIs. This reduces native dependency surface area for the test harness while keeping existing committed cache DBs usable.

Changes:

• Replace keyv/@keyv/sqlite usage in the simulation cache with a minimal node:sqlite-backed key/value store.
• Remove keyv and @keyv/sqlite from extensions/copilot dependencies and re-resolve the lockfile.
• Update cache-layer enumeration logic to work with the new store.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
extensions/copilot/test/base/cache.ts	Introduces a minimal node:sqlite store and swaps the simulation cache over from keyv.
extensions/copilot/package.json	Drops keyv and @keyv/sqlite dependencies (and related overrides).
extensions/copilot/package-lock.json	Removes the transitive native sqlite dependency tree and updates lock metadata.

Files not reviewed (1)

• extensions/copilot/package-lock.json: Generated file