feat(cli): TUI slash command parsing + local commands (P8-009) (#176)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/cli/src/tui/commands/index.ts

@@ -0,0 +1,5 @@
+export { parseSlashCommand } from './parse.js';
+export { commandRegistry, CommandRegistry } from './registry.js';
+export { executeHelp } from './local/help.js';
+export { executeStatus } from './local/status.js';
+export type { StatusContext } from './local/status.js';