Prevent Google Assistant entity sync from blocking startup

[frenck]

Breaking change

Proposed change

The Google Assistant integration syncs entities to Google's Homegraph API during HA startup using async_at_start. This makes HTTP requests to Google's servers, and when those are slow or unresponsive, it blocks the entire startup phase - preventing other integrations and add-ons from loading for minutes.

This changes the sync to use async_at_started instead, which defers the sync until after HA has fully started. The entity sync still happens automatically, just without blocking other integrations from starting.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Something is blocking Home Assistant from wrapping up the start up phase: AbstractConfig.async_initialize.<locals>.sync_google #130093
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

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[home-assistant]

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[Copilot]

Pull request overview

This PR defers Google Assistant Homegraph entity sync until after Home Assistant reaches the started state, avoiding startup delays caused by slow external HTTP requests.

Changes:

• Replaces the startup callback from async_at_start to async_at_started.
• Keeps automatic Google Assistant entity sync behavior, but moves it out of the startup wait path.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.