- Add `agents tui` command wiring and Textual app scaffolding for interactive TUI startup.
- Implement TUI persona schema/registry/state with local YAML persistence and per-session persona binding.
- Add three input-mode flows: Normal (`@` references), Command (`/` slash commands), and Shell (`!` passthrough).
- Introduce TUI widgets/overlays for prompt, persona bar, reference picker, and slash command interactions.
- Extend REPL command routing to support persona/session commands and reference/shell dispatch behavior.
- Add test coverage: Behave features + step definitions, Robot TUI smoke test, and ASV fuzzy-reference benchmark.
ISSUES CLOSED: #695