feat: ADR-0006 §8 steps 4-5 — undo/redo commands + confirm-modal flow
Commands & grammar (step 4):
- AppCommand::Undo/Redo, grammar nodes + REGISTRY entries, catalog
help/usage + keys; parse tests
- replay skips undo/redo (is_app_lifecycle_entry_word) + completion
entry-keyword lockstep; replay-skip test extended
Wiring (step 5):
- Action::{PrepareUndo,PrepareRedo,Undo,Redo} + AppEvent::{UndoPrepared,
UndoUnavailable,UndoSucceeded,UndoFailed}
- App: undo_enabled flag, Modal::UndoConfirm, dispatch + event handling
+ confirm-key handler (Y confirms / N/Esc cancels); "turned off" when
--no-undo; "nothing to undo/redo" when empty
- ui::render_undo_confirm names the command + snapshot time
- runtime: opens with undo enabled (!--no-undo), threads it through the
project-switch path, spawn_prepare_undo/spawn_undo (peek->modal,
restore->refresh tables + schema cache)
- 9 Tier-1 app tests + 3 parse tests
1692 passed / 0 failed / 1 ignored; clippy clean.
claude@clouddev1
25800e3eb5