Use Couchbase SDK readiness waits in tests

[cristianrgreco]

Summary

• update the Couchbase SDK dev dependency from 4.7.0 to 4.7.1
• wait for bucket KV readiness before SDK KV operations in Couchbase tests
• update the docs-backed connect/query example to show the same readiness pattern

Verification

• npm run format
• npm run lint
• npm run check-compiles
• npm run test -- packages/modules/couchbase/src/couchbase-container.test.ts -t "should create and use a bucket with KV service only"

Test results

The focused KV-only Couchbase test passes. A full sequential Couchbase test-file run reached 8/9 passing locally; the remaining failure was a Docker port-bind timeout before Couchbase startup logic, not a failure in the SDK readiness path.

Breaking change evidence

This is not breaking. The change updates a test-only dev dependency and test/example code only; it does not change the published module API or runtime behavior.

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