Mechanical, behaviour-neutral extraction along the existing cli_*_mixin.py
pattern: the ten _init_* constructor phases become CLIInitMixin
(hermes_cli/cli_init_mixin.py) and the fourteen _tui_* run-loop phases
(input dispatch, after-turn, startup banner/prewarm/maintenance, application
build, signal handlers, shutdown) become CLITuiRuntimeMixin
(hermes_cli/cli_tui_runtime_mixin.py). __init__ and run() stay in cli.py as
the orchestrators. Every moved body is AST-identical to the base copy; cli.py
module names are resolved lazily through cli so monkeypatch seams survive.
cli.py 4835 -> 3960 lines.
