Refactor: cli.main if/elif chain → command dispatch table

[JRS1986]

Context

cli.py:90-196 is a 100-line if/elif cascade dispatching on args.command. Each branch is short on its own, but the function mixes argument access, business logic, and printing. Adding a new command requires editing two unrelated places (parser definition + dispatch chain), and there's no isolation between handlers.

Recommendation

Move each command into its own function and use a dispatch dict:

COMMANDS: dict[str, Callable[[argparse.Namespace], int]] = {
    \"probe\": _cmd_probe,
    \"doctor\": _cmd_doctor,
    \"credentials\": _cmd_credentials,
    \"skill\": _cmd_skill,
    \"knowledge\": _cmd_knowledge,
    \"orchestrate\": _cmd_orchestrate,
    \"adapt\": _cmd_adapt,
    \"route\": _cmd_route,
    \"select-model\": _cmd_select_model,
    \"workflow\": _cmd_workflow,
    \"init\": _cmd_init_or_wizard,
    \"wizard\": _cmd_init_or_wizard,
}

def main(argv: list[str] | None = None) -> int:
    args = build_parser().parse_args(argv)
    handler = COMMANDS.get(args.command)
    return handler(args) if handler else 2

Each _cmd_* is independently testable.

Verification

• main() shrinks to <10 lines.
• Each command handler is callable directly from a test (some already are via the existing tests/test_cli.py).
• All 51 tests still pass.

Carry-over from prior code review (F11).