Ichthyostega ce40b83bb6 Establish DataSink identity and fix remaining tests ...

The test suite is now **green** again.

The design rework and clean-up of unnecessary test-driven functionality
in the `DiagnosticBufferProvider` and `DiagnosticOutputSlot` required
to break some very old test-setup, using fake instances of the relevant
context facilities. This setup however was used by the newer family
of test support facilities, notable the `MockJob`, `MockSegmentation`
and `MockDispatcher`. These required a set of `DataSink` handles to be
present (even while they are not used currently).

This could be fixed easily now, relying on the simplified internal structure
of the `OutputSlot`: by re-arranging the types, the implied identity of the
`DataSink` handles could be made explicit, allowing for equality comparison.

__Remark__: even while `DataSink` with only a single abstracted function,
using function notation turned out to be rather confusing at usage site.
Naming this function as `lockFrame(frameNo)` clarifies its purpose nicely.
That call is effectively abstracted by means of the ''buffer type'',
relying on the VTable in the `BufferProvider` implementation.

2026-06-01 23:55:10 +02:00

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