[wcandillon]

Implicit device synchronization was explained three times (Native APIs, Worklets, Native Extensions), each with Dawn's feature doc, the per-device mutex and, on the Worklets page, Dawn's "heavy-handed / may deadlock" remark.

The reader-facing contract is short, so it now lives once in Worklets → Thread safety:

• a device created on the JS thread can be used from worklets;
• never share a command encoder across threads;
• drive each canvas context from a single runtime;
• the implicitDeviceSynchronization: false opt-out, linked to the API reference.

Native APIs → Threading model keeps the overview, the installWebGPU() snippet (which was orphaned after the synchronization section) and the device.lost callout, and links to the contract. The Native Extensions entry keeps the flag and the requiredFeatures note, without the mutex internals.

[github-actions]

🎉 This PR is included in version 0.17.0 🎉

The release is available on:

• v0.17.0
• GitHub release

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