Build Agent SDK on macOS

[bennycode]

Build Agent SDK on macOS in CI

Extends the agent-sdk.yml build job to run on both Ubuntu and macOS using a matrix strategy. The job name now reflects the OS for each matrix entry, and fail-fast: true is set so a failure on either platform stops the other.

^{Macroscope summarized 2ac1c5c.}

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Project	Deployment	Actions	Updated (UTC)
xmtp-chat-api-service	Ready	Preview, Comment	Mar 16, 2026 8:38pm
xmtp-js-xmtp-chat	Ready	Preview, Comment	Mar 16, 2026 8:38pm

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Latest commit: 2ac1c5c

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[macroscopeapp]

Approvability

Verdict: Approved

This is a minor CI configuration change that adds macOS to the build matrix. The author is the designated code owner of the workflow file being modified, and the change has no runtime or production behavior impact.

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