fix: reset _busPromise on publish failure to allow reconnect

[four-bytes-robby]

Resets _busPromise to null on publish failure so next call retries instead of using cached failed promise.

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Summary by cubic

Reset _busPromise to null on publish failure so the next write retries connection instead of using a cached failed promise. Prevents the bus from getting stuck after transient errors.

^{Written for commit 3ba7338. Summary will update on new commits.}

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✅ Created PR with unit tests: #147