feat(core): clone commands and actions when binding runtimes

Add clone support across Action types and Command so commands can be safely
registered or runner-bound without mutating the original instances.

- clone BaseAction implementations across simple, composite, IO, prompt, file,
  HTTP, process, and signal actions
- bind cloned commands in Falyx.add_command_from_command() and CommandRunner
- preserve local never_prompt settings when cloning actions
- rename shared runtime state from options to options_manager for consistency
- seed root and execution option namespaces consistently
- apply scoped root and namespace option overrides during routing and dispatch
- improve namespace completion by delegating option suggestions to FalyxParser
- enrich missing-value errors and error hints

tests/test_falyx/test_prompt_contract.py

@@ -0,0 +1,21 @@
+from falyx.action import Action
+from falyx.command import Command
+
+
+async def test_action_local_never_prompt_bypasses_command_confirmation(monkeypatch):
+    called = False
+
+    async def fake_confirm(*args, **kwargs):
+        nonlocal called
+        called = True
+        return True
+
+    monkeypatch.setattr("falyx.command.confirm_async", fake_confirm)
+
+    action = Action("Do Thing", lambda: "ok", never_prompt=True)
+    command = Command.build("D", "Do Thing", action=action, confirm=True)
+
+    result = await command()
+
+    assert result == "ok"
+    assert called is False