docs: spec for interactive grouping of the current view

A sibling to the interactive-sort spec: group the buffer you're looking at on demand, without configuring the grouping in Linear and re-fetching. pearl-set-grouping completing-reads a dimension (status, project, assignee, priority, or none) and regroups client-side, since those four dimensions are already in each issue's drawer.

The crux is preserving unsaved edits while the outline level changes. Grouping moves an issue from level 2 to level 3 under a group heading, so the regroup moves each subtree byte-for-byte and shifts only its heading stars. That's the edit-preserving move sort uses, plus a level delta. The interactive choice persists under :client-group, beside a view's own :group. A single pearl--effective-grouping resolver feeds every render and merge path, so a refresh reproduces what's on screen.

Cycle is deferred: it isn't rendered into the drawer, so an offline regroup can't read it. A separate task adds cycle drawer fields and re-enables it.

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