Add waitForRegistrationVisible

[neekolas]

Add waitForRegistrationVisible option to browser and node SDK client registration

• Adds an optional waitForRegistrationVisible field to OtherOptions in both the browser and node SDKs, accepting WasmVisibilityConfirmationOptions / VisibilityConfirmationOptions respectively.
• When set, Client.register passes the option through to the underlying registerIdentity call, causing registration to block until the identity is visible on the network.
• In the browser SDK, the option is forwarded through the worker message pipeline via the client.registerIdentity action type.
• Both WasmVisibilityConfirmationOptions and VisibilityConfirmationOptions are re-exported from their respective SDK index files.
• Updates @xmtp/node-bindings and @xmtp/wasm-bindings to dev builds that support this feature.

^{Macroscope summarized 2c2a85b. (Automatic summaries will resume when PR exits draft mode or review begins).}

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Project	Deployment	Actions	Updated (UTC)
xmtp-js-xmtp-chat	Ready	Preview, Comment	Apr 1, 2026 0:35am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
xmtp-chat-api-service	Skipped		Apr 1, 2026 0:35am

[neekolas]

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This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• Add waitForRegistrationVisible #1774 👈 (View in Graphite)
• Fix flaky stream retry tests by polling instead of fixed sleep #1775
• Add devcontainer configuration #1773
• main

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