Record at the code what W5 measured about the list

[donislawdev]

W5 of the performance series after the external report of 2026-09-28 (items G-1, G-2, G-3, G-9). Every lever was measured, and none of them is worth a change to the product. This PR records the results beside the code they are about, so the next outside report does not propose them a third time.

Comments only. No behaviour, test or contract changes.

What was measured, all inside the process with nothing polling the window, Release build, 774 entries:

• Reaction of the list to a query is a median of 25-55 ms. Our code is 2-4% of the interface thread, in a managed profile and again in kernel samples. The rest is WPF taking a new set of rows. The note at RowList.Reconcile still said 143 ms and "open where it goes" - replaced.
• Trigger bindings on a row go from 13 to 3 when each mark shares one Binding object. Query and scroll times did not move (interleaved runs, overlapping ranges). Not adopted - noted in Themes/Marks.xaml.
• Scope switch costs 33-68 ms (medians). A reset could only apply between Services and Drivers and would break selection and scroll elsewhere. Kept - noted at MainViewModel.Scope.
• Reread on a "Moved" tick is 0.7-1.0 ms against 0.3-0.5 ms for Apply alone. Kept - noted at Reread.

Checked: architecture tests 182/182, MarkDistinctionGuards 7/7.

🤖 Generated with Claude Code

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