Add a first-class active-session orchestrator for the Ink TUI:
- list, activate, close, and launch live process-local TUI sessions
- hydrate committed and in-flight output when switching sessions
- dispatch a new prompt session from the +new row with session-scoped model picks
- expose a clickable live-session count in the status chrome
- preserve stable row order while initially focusing the current session
- support mouse hit-testing for floating orchestrator overlays
- add backend and frontend regression coverage for the lifecycle and UI helpers
Document the three protocols already available for driving hermes-agent
from external programs — ACP, the TUI gateway JSON-RPC, and the
OpenAI-compatible API server — with a 'which one should I use' guide and
a Pi-style RPC command mapping table. Sidebar entry under Developer
Guide -> Architecture.
