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_falyx/test_help.py

@@ -51,7 +51,7 @@ async def test_render_help(capsys):
         aliases=["SC"],
         help_text="This is a sample command.",
     )
-    await flx._render_help()
+    await flx.render_help()
 
     captured = capsys.readouterr()
     assert "This is a sample command." in captured.out
@@ -75,7 +75,6 @@ async def test_help_command_by_tag(capsys):
     await flx.execute_command("H -t tag1")
 
     captured = capsys.readouterr()
-    print(captured.out)
     text = Text.from_ansi(captured.out)
     assert "tag1" in text.plain
     assert "This command is tagged." in text.plain