feat: add recursive namespace routing and standalone runner polish

- introduce namespace-aware routing with RootParseResult, RouteResult, and InvocationContext
- register submenus as FalyxNamespace entries and resolve them through _entry_map
- refactor FalyxParser to parse only root options and leave recursive routing to Falyx
- add prepare_route, resolve_route, and route dispatch flow to Falyx
- update validator and completer to understand namespace entries and route results
- unify help/TLDR rendering APIs and add custom_tldr support on Command
- tighten Command.resolve_args error handling and parser type validation
- improve CommandRunner dependency validation and argv handling
- add BottomBar.has_items and improve wrapped executor error messages
- add tests for execution options, resolve_args, command runner, and route-aware validation

tests/test_command_argument_parser.py

@@ -1,5 +1,7 @@
 import pytest
+from rich.text import Text
 
+from falyx.console import console as falyx_console
 from falyx.exceptions import CommandArgumentError
 from falyx.parser import ArgumentAction, CommandArgumentParser
 from falyx.signals import HelpSignal
@@ -825,4 +827,11 @@ async def test_render_help():
     parser.add_argument("--foo", type=str, help="Foo help")
     parser.add_argument("--bar", action=ArgumentAction.APPEND, type=str, help="Bar help")
 
-    assert parser.render_help() is None
+    with falyx_console.capture() as capture:
+        parser.render_help()
+    output = Text.from_ansi(capture.get()).plain
+    assert "usage:" in output
+    assert "--foo" in output
+    assert "Foo help" in output
+    assert "--bar" in output
+    assert "Bar help" in output