Bernardo Magri 23bcb20ab5 feat(sync): add provider contracts and OAuth token broker ...

Draft the generic SyncProvider/SyncObserver contracts and implement
OAuthTokenBroker: valid access tokens with a five-minute refresh skew,
rotation persisted before use so a new refresh token is never lost,
400/401 refresh rejections erase the secret and surface
AccountDisconnected, and no credential material in error messages.

2026-07-20 22:50:54 +01:00

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