feat(workbench): interaction substrate — list nav, virtualization, panel chrome, inspector resize, palette verbs (Wave R R0d)
- useListNavigation: shared j/k/arrows/Home/End/Enter keyboard spine,
container or window scope, input guard, roving tabindex. Replaces
ProposalsRoute's bespoke window listener (one pattern app-wide).
- VirtualizedList over @tanstack/react-virtual composing the hook;
evidence lists render O(viewport).
- Panel: standard header/toolbar/body chrome for routes.
- Inspector resize: Shell center cell becomes SplitPane(main, inspector)
when open; width persists via guarded storage (SplitPane id).
- Palette action verbs: Command gains kind (navigate|action); Shell
registers Toggle inspector + Copy evidence link; EvalsRoute registers
'Run eval lane <lane>' per read-only lane (same POST /evals/run).
- shortcutRegistry: binding sites register what they handle while
mounted; KeyboardHelp renders FROM the registry — advertising an
unbound shortcut is structurally impossible. j/k, /, Enter rows
(removed in R0a as false) return as live registry entries.
- Kbd primitive (front-loaded from R1); SearchInput registers '/';
SearchInput wired into Proposals + Replay lists with client filters.
- Preview entries for Kbd/Panel/VirtualizedList.
Verified: build green; vitest 33 files / 245 tests EXIT=0 (~5.5s);
playwright 12/12.
c54a942871