Phase 7: netfox + godot-jolt stack upgrade

Stack installed:
- netfox v1.35.3 (core + extras + noray + internals)
- godot-jolt v0.16.0-stable

Architecture:
- Server: ENet transport (works headless, no netfox deps)
- Client/Editor: netfox rollback (RollbackSynchronizer, TickInterpolator)

New/modified:
- docs/migration-netfox-plan.md — migration architecture
- scripts/network/network_manager.gd — netfox-aware ENet fallback
- scripts/network/player.gd — clean base player
- client/characters/player_netfox.gd — rollback player w/ WeaponManager
- client/characters/input/player_net_input.gd — BaseNetInput subclass
- client/characters/character/fps_character_controller.gd — netfox input feed
- client/weapons/ — weapon data, registry, TacticalWeaponHitscan, WeaponManager
- client/scripts/round_replicator.gd — client-side round state bridge
- server/scripts/round_manager.gd — improved state machine
- server/scripts/plugin_api/plugin_manager.gd — refined plugin system
- config: enemy_tag, ally_tag for meatball targeting

Removed: old C++ SimulationServer GDExtension (replaced by netfox rollback)

server/server-browser-api/venv/lib/python3.11/site-packages/starlette/_utils.py

@@ -0,0 +1,111 @@
+from __future__ import annotations
+
+import functools
+import sys
+from collections.abc import AsyncGenerator, Awaitable, Callable, Generator
+from contextlib import AbstractAsyncContextManager, asynccontextmanager
+from typing import Any, Generic, Protocol, TypeVar, overload
+
+import anyio.abc
+
+from starlette.types import Scope
+
+if sys.version_info >= (3, 13):  # pragma: no cover
+    from inspect import iscoroutinefunction
+    from typing import TypeIs
+else:  # pragma: no cover
+    from asyncio import iscoroutinefunction
+
+    from typing_extensions import TypeIs
+
+if sys.version_info < (3, 11):  # pragma: no cover
+    try:
+        from exceptiongroup import BaseExceptionGroup
+    except ImportError:
+
+        class BaseExceptionGroup(BaseException):  # type: ignore[no-redef]
+            pass
+
+
+T = TypeVar("T")
+AwaitableCallable = Callable[..., Awaitable[T]]
+
+
+@overload
+def is_async_callable(obj: AwaitableCallable[T]) -> TypeIs[AwaitableCallable[T]]: ...
+
+
+@overload
+def is_async_callable(obj: Any) -> TypeIs[AwaitableCallable[Any]]: ...
+
+
+def is_async_callable(obj: Any) -> Any:
+    while isinstance(obj, functools.partial):
+        obj = obj.func
+
+    return iscoroutinefunction(obj) or (callable(obj) and iscoroutinefunction(obj.__call__))
+
+
+T_co = TypeVar("T_co", covariant=True)
+
+
+class AwaitableOrContextManager(
+    Awaitable[T_co], AbstractAsyncContextManager[T_co], Protocol[T_co]
+): ...  # pragma: no branch
+
+
+class SupportsAsyncClose(Protocol):
+    async def close(self) -> None: ...  # pragma: no cover
+
+
+SupportsAsyncCloseType = TypeVar("SupportsAsyncCloseType", bound=SupportsAsyncClose, covariant=False)
+
+
+class AwaitableOrContextManagerWrapper(Generic[SupportsAsyncCloseType]):
+    __slots__ = ("aw", "entered")
+
+    def __init__(self, aw: Awaitable[SupportsAsyncCloseType]) -> None:
+        self.aw = aw
+
+    def __await__(self) -> Generator[Any, None, SupportsAsyncCloseType]:
+        return self.aw.__await__()
+
+    async def __aenter__(self) -> SupportsAsyncCloseType:
+        self.entered = await self.aw
+        return self.entered
+
+    async def __aexit__(self, *args: Any) -> None | bool:
+        await self.entered.close()
+        return None
+
+
+@asynccontextmanager
+async def create_collapsing_task_group() -> AsyncGenerator[anyio.abc.TaskGroup, None]:
+    try:
+        async with anyio.create_task_group() as tg:
+            yield tg
+    except BaseExceptionGroup as excs:
+        if len(excs.exceptions) != 1:
+            raise
+
+        exc = excs.exceptions[0]
+        context = None if exc.__suppress_context__ else exc.__context__
+        raise exc from exc.__cause__ or context
+
+
+def get_route_path(scope: Scope) -> str:
+    path: str = scope["path"]
+    root_path = scope.get("root_path", "")
+    if not root_path:
+        return path
+
+    if not path.startswith(root_path):
+        return path
+
+    if path == root_path:
+        return ""
+
+    if path[len(root_path)] == "/":
+        return path[len(root_path) :]
+
+    return path