Issue #3622325: Follow audit_trail's write API rename: event() becomes record()

audit_trail #3620335 renames AuditTrailInterface::event() to record(). Pre-1.0, so there is no BC layer: the old name is gone, and this module's call would raise Error: Call to undefined method.

One call in OrchestraAuditTrailSubscriber, two docblocks, and the eight ->method('event') expectations in OrchestraAuditTrailSubscriberTest.

No behaviour change — the method name is the whole diff.

audit_trail #3620335 is merged, and this module's composer constraint is 1.x-dev@dev, so CI here already resolves the renamed API.

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