Bottom-sheet ctrl-k-style search over sessions, a `>` command
registry and `~` directories (docs/COMMAND-BAR.md), with a
long-press action menu for rename/kill/spawn-similar. v1 uses a
simple weighted substring/fuzzy matcher rather than the scored
matcher web/#146 and the TUI/#147 share. Wires an FAB and a
best-effort hardware Ctrl-K into MaestroApp.