fix: clear lens cache on re-bootstrap (#5)

## Summary

- Fix stale lens references after SDK re-initialization: the lens cache
retained objects from the old `lensRepository`, causing `fetchLens` to
return lenses bound to a destroyed kit instance
- Clear `lensCache` and reset `lenses` state at the start of the
bootstrap effect, before the new kit is created

## Test plan

- [ ] New test: "should clear lens cache on re-bootstrap" — verifies
that after a `stabilityKey` change triggers re-bootstrap, previously
cached lenses are evicted and `fetchLens` calls the new kit's `loadLens`
- [ ] Full test suite passes

Bump version to 0.1.0, add repo metadata, align demo deps (#1)

- Bump package version from 0.0.2 to 0.1.0
- Add repository and homepage fields to package.json
- Update demo @snap/camera-kit from ^1.11.0 to ^1.13.0 to match peer dep

0.0.2