docs(metadata-protocol): record that hidden does not govern getUiView's default sort (#14493)

`getUiView`'s list branch withholds a declared-`hidden` field from `columns`
but still names `created_at` in `sort`. Ruled 2026-09-01: `hidden` governs
display, not derived ordering, so the current behaviour is correct. State it
beside the `sort:` construction so the next reader does not repair it as
residue. Comment only: no behaviour change, no schema change.


Claude-Session: https://claude.ai/code/session_0112hMx9hjJ9BgB28X97DS68

Co-authored-by: Claude <noreply@anthropic.com>

Author: os-musk

packages/metadata-protocol/src/protocol.ts

@@ -8209,6 +8209,7 @@ export class ObjectStackProtocolImplementation implements
                         label: fields[f]?.label || f,
                         sortable: true
                     })),
+                    // `hidden` withholds the column; it does not govern the derived default sort (ruled 2026-09-01).
                     sort: fields['created_at'] ? ([{ field: 'created_at', order: 'desc' }] as any) : undefined,
                     searchableFields: columns.slice(0, 3) // Make first few textual columns searchable
                 }